Final score - Chelsea Under-18s 3-3 West Ham United Under-18s (AET - Chelsea win 5-4 on penalties)
Dylan Tombides to offer a closing thought: "What a game of football here at Staines Town FC. Both sides showed great courage and spirit to come from being behind to equalise. It's a gruelling way to lose but there has to be a winner and a loser. Credit to the lads for their hard work and dedication tonight as it showed at the end with everyone on their backsides having given it all for the shirt.
"As for me, I've been given a high chance of never recurring for the rest of my life but it's now a case of me taking it slowly as I come back to fitness and not giving myself problems in the meantime."
4-5 - Kane sends Wootton the wrong way and Chelsea go through to the quarter-final.
4-4 - Vose tries to outwit the keeper but it doesn't work. Instead, it's straight at Blackman.
4-4 - Feruz puts his kick over!
4-4 - What a penalty under pressure! Potts side-foots into the top left-hand corner. Feruz for Chelsea to win it...
3-4 Chelsea - Baker hits it into the top left-hand corner. Potts must score...
3-3 - Chambers smashes the ball high and straight and Blackman dives out of the way.
2-3 Chelsea - Affane slams the ball left-footed past Wootton's dive.
2-2 - Blackman gets a touch, but Powell's penalty has enough pace to beat him high to the keeper's left.
1-2 Chelsea - Piazon sends Wootton the wrong way, tucking it into the bottom right-hand corner.
1-1 - Elliot Lee is denied. Blackman dives to his right to keep the low shot out.
1-1 - Chalobah tucks his penalty into the bottom right-hand corner.
1-0 West Ham - Turgott scores!
The penalties will be taken in the goal to our right, with Blair Turgott taking the first kick. Both teams are lined up on the halfway line in traditional fashion...
Dylan Tombides: "We have so many penalty takers. There are lots of options. I feel Chambers, Elliot Lee, Vose, Powell and Turgott will take, but that's a guess. David Wootton is phenomenal and is good in penalty situations. He's had a great game so hopefully he can be the hero again!"
121 mins - That's it. Penalties!
120 mins - We're going to have ONE added minute. Chelsea have one last chance from a throw as Shaw clears his lines. Both teams are out on their feet, but what entertainment!
118 mins - West Ham have a throw deep inside the Chelsea half. Can they fashion a late chance? Not this time as Shaw overhits his cross. Goal kick. The attendance tonight is 1,588. Chelsea break but they too concede a free-kick.
Dylan Tombides: "David Wootton with another sublime save late on. I still think there will be another chance for someone to nick a winner."
117 mins - First Chelsea come close from a free-kick that is hacked clear and West Ham break. Vose is again involved, holding up play before releasing Turgott. He has a shooting chance but fires over from the angle.
116 mins - Take a bow David Wootton AGAIN. He is out so quickly as Piazon plays in Feruz and he is in on goal. Great save by the No1.
114 mins - Chelsea pressing but first Powell and then Chambers stand firm.
113 mins - After what seems like an eternity, No7 Affane blasts his shot over the wall and over the bar. The minutes are ticking by towards a dreaded penalty shootout.
111 mins - Chelsea have a free-kick in a very threatening area as Piazon is brought down by Shaw. It's a yard outside the box, inside the D, dead centre.
109 mins - West Ham on top so far in extra-time half No2. Chelsea themselves look a bit tired since the re-start. Great belief from the Hammers.
107 mins - Elliot Lee is out wide right and collects a pass from Turgott. He crosses for the No10, but it is a yard too high and Blackman claims.
106 mins - We're underway for the final time. Either one team scores a winner in the next 15 minutes or we're going to penalties.
Dylan Tombides: "I think there is a goal in this game, still. A lot of the lads are looking tired but that's understandable after 105 minutes of hard work."
Half-time in extra-time score - Chelsea Under-18s 3-3 West Ham United Under-18s
107 mins - Vose takes and Chelsea clear, but the whistle goes for the end of the first half of extra-time.
106 mins - Into the one minute of added time and Fanimo has run himself into the ground. He goes down but is up again under his own steam 30 seconds later. West Ham win a corner from Nditi's needlessly strong backpass.
104 mins - Potts is booked as he misjudges a header wide on the Chelsea right. Free-kick to the hosts as the first half of extra-time approaches it's conclusion.
103 mins - Blackman is nearly embarrassed by Elliot Lee as the striker charges down his clearance. The ball breaks to Ake, who clears his lines and spares the goalkeeper's blushes.
102 mins - Turgott is muscled off the ball on halfway and West Ham are short at the back. Baker should pass to Piazon but instead shoots and it goes miles over the top.
101 mins - Dylan Tombides: "This could still go either way. West Ham have been a lot better and David Wootton has not been anywhere near as busy in extra time as he was in earlier halves."
99 mins - Turgott takes on his man and is challenged hard near the corner flag. For a while he is out of the game, but he's back on in time to receive Vose's pass and beat his man. He cuts the ball back for Vose, who makes a hash of his first shot but then volleys goalwards. Blackman scrambles the ball behind for a corner. Fanimo takes and the goalkeeper makes a fine high catch.
96 mins - Better from West Ham as they move the ball swiftly through the midfield. Hurley tries to play in Young, but his pass is cut out. It's even-stevens so far in extra-time.
95 mins - The two sides are looking a bit tired now. Turgott has committed a fair few fouls now and his latest indiscretion earns him a yellow card.
91 mins - West Ham kick-off again...
Score at 90 minutes - Chelsea Under-18s 3-3 West Ham United Under-18s
Dylan Tombides: "What a finish to the game. West Ham had seemingly won it with a last-ditch game. Chelsea sent everyone forward and equalised within about 15 seconds of the kick-off. The boys have got to retain their belief and be aggressive as they were in the final ten minutes of normal time, running at them and causing them all sorts of problems."
96 mins - I don't know what to say, but that's full-time. We're into an extra half-an-hour...
95 mins - Unbelievable. Vose dances forward from the re-start and slots the ball wide left for Fanimo, but he's offside.
94 mins - GOAL! What a finish to this game. Chelsea come from the kick-off and a shot flashes across goal and hits the far post. It rebounds into the path of Chalobah, who finishes into the unguarded net. Unbelievable.
93 mins - GOAL! ELLIOT LEE! Hurley collects a pass in midfield and finds Vose, who turns away from his man and beats another before finding Lee on the right of the penalty area. He takes a touch and drives a low shot inside the far post.
91 mins - Swift makes some space for a shot from 22 yards but it slices slightly off the outside of his right boot and thuds into the advertising boards.
90 mins - We will have at least FOUR minutes of added time.
89 mins - Potts is urging his team-mates on as we enter the final stages. It's all gone a bit cagey out there as extra-time looms large.
88 mins - Physio Jon Urwin has Chambers back on his feet again, so it must have been cramp as the centre-back is on again.
86 mins - West Ham are right on top, believe it or not! Vose and Hurley combine before the cross comes in but it's cleared away. Meanwhile, Chambers is down and needs some treatment for cramp. At least, we all hope it is only cramp...
84 mins - Dylan Tombides: "It's anxious here. West Ham have come into the match a lot more in the last ten minutes, causing Chelsea a lot more problems. We still have to be wary of Chelsea's quality because they could take a chance if they create one."
82 mins - Vose threatens again. This time the ball is worked square to Powell, who curls a shot a couple of yards wide of the far post. The Hammers believe here...
Blair Turgott scored a superb second equaliser for the Hammers
79 mins - The Hammers make their final change and it's like for like as Miles is replaced by Lamar Hurley.
77 mins - GOAL! Brilliant from Vose and Elliot Lee and Turgott finishes. Vose picks the ball up and brings it down the middle of the pitch. He finds Elliot Lee, who lays it off and Vose pokes it right to Turgott, who makes no mistake from 16 yards. Game on!
77 mins - Dylan Tombides is devouring a bacon bap in the seat next to me. When he's finished, we'll ask him for his take on the final ten minutes.
75 mins - West Ham have a corner. Fanimo collects it short but his cross is too deep. The ball is cleared to Miles, who wins a free-kick. Fanimo takes it but the flag goes up for offside.
74 mins - West Ham create their own problems by not clearing their lines and right-back Kane has another chance to shoot. This time he screws he ball wide of the near post.
72 mins - Dylan Tombides: "For all David Wootton's hard work, Chelsea were applying a lot of pressure and the goal was coming. We haven't been at our best tonight but there is still enough time for a bit of individual brilliance."
71 mins - Powell beats one challenge before over-running the ball and having it smashed into his unmentionables. The referee blows for handball!
69 mins - Affane's ball in is fiendish but West Ham somehow scramble the ball clear.
68 mins - Feruz gets away down the left and is taken down by Shaw. He gets a talking-to from the referee.
David Wootton makes an outstanding save from Lucas Piazon
66 mins - Lee was injured trying to challenge Feruz there and he's got to be replaced. Frazer Shaw is on at left-back, with Potts going into the centre.
64 mins - GOAL! Feruz scorches on to a through ball and outpaces the two centre-backs before finishing confidently past the advancing Wootton. That was lightning pace by the No9, but it all stemmed from a careless pass in the midfield.
63 mins - Better from the Hammers as Turgott runs his man and crosses low. The ball is cleared but Chambers finds Kenzer Lee, who feeds Fanimo. His ambitious pass for Elliot Lee is too strong and Blackman collects.
61 mins - Right-back Kane shoots again and it's too high and flies into the fir trees behind the goal. No trouble for Wootton this time, but Chelsea are upping the ante again.
Midfielder Taylor Miles scores with a fantastic 25-yard strike
59 mins - Dominic Vose is on for Sadlier. Dylan Tombides: "Dom could be a game-changer for us and win this for West Ham."
58 mins - Dylan Tombides: "David Wootton has kept up his performance with another fantastic save. That should have been a goal, but he was brave and out fast to keep West Ham in it."
56 mins - Kane gets around the back and crosses low. Piazon's shot is blocked by Young and Wootton makes another brilliant save from Affane. The follow-up is blasted just over by Kane. The West Ham fans respond with a chorus of 'Bubbles'.
55 mins - Seremba finds a colleague inside the box but Kenzer Lee stabs the ball out for a corner. The ball is delivered by Affane, but the No5 is there again to head clear.
54 mins - Elliot Lee scored a hat-trick against Chelsea at the end of last season and he has a sniff here as he chases Potts' long clearance. He beats two defenders to the bouncing ball but loses his footing.
52 mins - Blackman is in no man's land as Fanimo whips the left-footed free-kick to the far post. It's just too high and goes behind for a goal kick. Chelsea make a change with Osmanovic being replaced by Ismail Seremba.
51 mins - It has been better from West Ham since the break. Turgott's cross has Blackman scrambling and tipping the ball away. Fanimo collects and beats Nditi, who fouls him and is booked.
50 mins - Dylan Tombides: "Tony and Nick would have told the boys they can do better and will need to do better if we're going to make it through to the next round. We have the talent to get through. Tony and Nick will have been positive in their encouragement as they have high standards and high hopes for the team."
48 mins - Not a lot of action so far since the break. Dylan Tombides is here again for the second 45 minutes to offer his own take on proceedings from inside the squad.
Dylan Tombides with the whufc.com team and performance analysts
46 mins - No changes at half-time and the Hammers kick-off the second half...
Half-time score - Chelsea Under-18s 1-1 West Ham United Under-18s
46 mins - That's half-time. West Ham have ridden their luck but Miles' goal alone is worthy of keeping his side on level terms. Dylan Tombides: "It was an interesting half of football. West Ham could say they have created enough chances to be level, but Chelsea fans will think their side should be ahead. They would be if it weren't for David Wootton in the West Ham goal, who has had a sublime first half."
45 mins - Piazon this time, but his low shot from the edge of the D is straight at Wootton. We'll have ONE added minute.
44 mins - Wootton might need a new pair of gloves at half-time! This time Nditi nutmegs Young and shoots, but the goalkeeper dives to his left to push the ball well clear. Good save again.
43 mins - Turgott tracks back well to concede a corner. The initial delivery is cleared but Chelsea collect again through Affane. He shoots at the near post but Wootton is there again to make the catch.
42 mins - Dylan Tombides: "We've got players with great individual ability and Taylor has just illustrated that with a great strike from 25 yards. David Wootton has also had a sublime half to keep his team in the match."
41 mins - GOAL! MILES scores a worldy! Turgott brings the ball forward and plays a one-two with Miles. The ball is only half-cleared back to the West Ham No4, who rifles an unstoppable shot into the top right-hand corner from 25 yards plus. Quality strike.
40 mins - Sadlier's free-kick is low and easily cleared.
39 mins - Some intricate passing on the edge of the West Ham box and Chelsea nearly break through, but Kenzer Lee nips in and brings the ball away. Moments later, Fanimo wins a free-kick right up the other end of the pitch. Chance for West Ham...
37 mins - Chelsea come forward again and Piazon plays the ball right to Affane inside the box. His side-foot effort is wide of the near post.
36 mins - Great stuff. Turgott finds Elliot Lee and he holds the ball up for Powell on halfway. Powell waits before releasing Fanimo with a peach of a pass between Chalobah and Kane. Fanimo had gone a split-second too soon and is flagged offside as he goes around the goalkeeper.
34 mins - Sadlier has gone in behind Elliot Lee as a deep-lying forward, with Turgott out to the right wing.
33 mins - Chambers is booked for a foul on Swift. The Chelsea No8 has been the home side's best player so far. The central midfielder has controlled proceedings whenever the Blues have been on the attack.
33 mins - Some bad news - The two-day Holiday Coaching Course at Hullbridge Sports and Social Club this Thursday and Friday has been postponed due to a waterlogged pitch.
31 mins - Dylan Tombides: "After going 1-0 down, the Hammers have responded brightly and have created a couple of chances of their own. They look promising at times."
30 mins - West Ham have a couple of half-chances, but a shot from Elliot Lee is charged down. Turgott reaches the follow-up but he cannot fashion a cross into the danger zone.
28 mins - Wikipedia suggests Chelsea paid £5m to bring Piazon to England from Brazilian club Sao Paulo. The Brazil Under-17 international came up against Dylan Tombides as last year's FIFA U17 World Cup: "I remember playing against him when Brazil beat Australia 1-0. Chelsea obviously believe he has great potential."
27 mins - Wootton to the rescue again as Piazon is free inside the box. He tries to draw the keeper and square for a team-mate, but the goalkeeper keeps his eye on the ball and smothers.
25 mins - Miles collects a loose headed clearance and runs forward ten yards as the defenders try to mark Elliot Lee and Turgott to either side of the midfielder. He takes a chance and shoots left-footed, but Blackman makes the save low down.
23 mins - Piazon collects a pass from Swift and spreads play wide right to Kane, who takes a touch and crosses to the far post. Piazon has continued his run and heads powerfully towards goal. Wootton makes a fine reaction save. Potts just gets there to complete the clearance.
21 mins - Powell sends the free-kick in and Blackman punches clear for a throw.
20 mins - Chelsea are a big, strong side and they have definitely been the better team so far. West Ham are just struggling to keep the ball in the opposition half so far. That's better, though, as Turgott turns as he collects a pass from Young and is brought down ten yards inside Chelsea territory.
17 mins - Miscommunication as Chambers lets Affane's left-foot cross bounce and it hits the far post and comes clear. That was a close call.
16 mins - Two balls out of the stadium in 20 seconds! West Ham still on the offensive but every cross is being cleared by a Chelsea player so far.
14 mins - Kenzer Lee picks the ball up on halfway and does brilliantly to race down the left and win a corner. Fanimo delivers to the near post and Ake heads clear. Good response from the Hammers.
13 mins - West Ham have a corner as Ake challenges Turgott. Fanimo takes and I have no idea how West Ham do not equalise. The ball hits two players before ricocheting wide of the post off a Chelsea defender. The second corner is deep and won by Kenzer Lee, but Chelsea scramble it clear.
12 mins - Dylan Tombides: "The goal had been coming. It was good skill by Swift to create space for himself and cut it back for Baker to put it into the empty net. The goalkeeper couldn't do a thing."
11 mins - GOAL! It was coming... Swift runs into the box with the ball at his feet and takes three defenders with him. He gets to the byline and pulls the ball back for Baker, who has the simple chance from 12 yards and makes no mistake. Chelsea lead.
10 mins - Wootton again! Swift shoots from the corner of the box and the goalkeeper palms the ball out for a corner. Good save. The corner is headed out by Kenzer Lee to Piazon. The referee nearly gets in the way of Turgott and Piazon shoots from inside the D, but again Wootton is there.
9 mins - Wootton is worked for the first time and he stands firm. Kane races forward from right-back unchallenged. His low raking shot from 25 yards is pushed aside by the goalkeeper.
7 mins - Piazon breaks forward and slides the ball to Osmanovic. The return pass is a little strong and the ball flies off Piazon's foot and behind for a goal kick. That was very wayward. In fact, I'm not even sure if it was a shot or a poor first touch.
5 mins - Powell shows some real confidence to trick two defenders and backheel the ball to Turgott. He takes on Ake but pushes the ball out for a goal kick.
4 mins - West Ham are pressing high and a clearance falls to Potts 30 yards out. He shoots, but that is ambitious and flies well wide of the left-hand post. Chelsea then break themselves through the middle through Piazon and he finds Affane wide right. His cross is aimless, though, and Wootton collects.
2 mins - Most of the Hammers players have had a touch now and it's been a decent enough start from Haycock's team. Chelsea then come forward for the first time and right-back Kane crosses. Kenzer Lee heads clear.
7pm - Chelsea get us underway, but the Hammers are first to show through Elliot Lee, but Ake clears down the left wing.
6.57pm - Here come the two teams, led by captains Nathaniel Chalobah and Dan Potts. Chelsea are in all blue, while West Ham are in their traditional claret and blue. The Hammers have a quick huddle and part with a cheer of encouragement. Chelsea are going to kick-off...
6.57pm - Dylan Tombides: "You're just looking forward to the game now. You're excited rather than anxious because you want to get out and show people what you can do."
6.55pm - There is a decent crowd here at Wheatsheaf Park tonight. It's a shame that Chelsea don't play their home games at Stamford Bridge, but the pitch looks in excellent condition and it's a still, clear night here in Staines. The substitutes are just walking across the pitch to the dugouts on the far side, so kick-off cannot be too far away.
6.50pm - Two changes from the last round with David Wootton replacing the injured Jake Larkins in goal. Kieran Sadlier coming in for Rob Hall, who has a knock to his knee. Hall has travelled with the squad, but has not made quite made it.
6.45pm - The West Ham squad watched a motivational video on the bus on the way to Staines, featuring all the goals they have scored this season to a rousing soundtrack. Coach Nick Haycock is in positive mood and would naturally love to lead his side to glory in his first season in charge of the Under-18s.
6.40pm - Dylan Tombides on tonight's game: "It's going to be an interesting contest. Both teams have a lot of talent and promising youngsters coming through the ranks. West Ham are coming off a 4-1 win over Brighton in the previous round, while Chelsea beat Doncaster 2-1. I think our threats will come from the left wing through Matthias Fanimo and Dan Potts who loves to get forward. We need to take our chances because it's going to be a gruelling game. On the team coach, the boys were lively and looking forward to it. There is nothing to suggest we won't give Chelsea a good game tonight."
6.35pm - The team news is in -
West Ham United U18s: Wootton, Young, Potts, K.Lee, Chambers, Miles, Powell, Turgott, Fanimo, Sadlier, E.Lee
Subs: Baxter, Shaw, Hurley Vose, Boakye-Yiadom
Chelsea U18s: Blackburn, Kane, Chalobah, Ake, Nditi, Baker, Affane, Swift, Feruz, Osmanovic, Piazon
Subs: Nkumu, Beeney, Gordon, Nortey, Seremba
Good evening and welcome to Staines Town FC for tonight's FA Youth Cup fifth-round tie between Chelsea and West Ham United, which is being screened live on West Ham TV from 7pm.
The Blues and the Hammers have scored six FA Youth Cup triumphs between them - three each - and both clubs will have high hopes of glory should they win tonight. A quarter-final at Nottingham Forest awaits the victors.
Nick Haycock's side have already beaten the Blues on their travels this season, having scored a 3-2 win at Cobham in January. However, Chelsea will be no pushovers, having defeated West Ham 1-0 at Little Heath back in November.
Haycock has a strong squad at his disposal tonight, with England youth internationals Matthias Fanimo, Blair Turgott and Leo Chambers joined by new call-up Dan Potts, who will captain the side. Jake Young, Kenzer Lee, Taylor Miles, Jack Powell and Kieran Sadlier will also be looking to make their mark as the Hammers aim to reach the last-eight here in Surrey.
West Ham lifted the trophy in 1963, 1981 and 1999, while Chelsea were winners in 1960, 1961 and 2010. Historically, the two clubs met all the way back in 1957, when a Hammers team containing Bobby Moore, Geoff Hurst, Joe Kirkup and John Lyall beat the Blues at the Boleyn Ground on their way to the final, where they were beaten by Manchester United.
We should have the confirmed team news very shortly, so stay tuned.
We will be joined tonight by an expert summariser in Dylan Tombides, who will provide us with his insight into how the game is going during proceedings. The Australia Under-17 international forward has been back at Chadwell Heath this week after his recent illness and is hoping to be back in action soon.