A huge beaming smile shone out from Mohamed Diame's face as he spoke about West Ham United's magnificent victory over Chelsea.

The midfielder, who made a massive impact after coming on as a substitute at half-time, helped Sam Allardyce's men to hit back after the Blues had taken the lead in the first half through Juan Mata.

After Carlton Cole scored his first goal of the season to level, it was then Diame who put the Hammers in front after he met a sliding pass from the striker and struck the ball into the back of the net. Fellow substitute Modibo Maiga then scored West Ham's third to seal a famous victory.

For Diame, who made an immediate mark as soon as he was on the pitch, it was a great feeling to not only score but win against the reigning European champions.

Smiling broadly, the No21 said: "I was very happy to score, but also to help the team to come back from a goal behind and then go on to win the game.

"The three points, especially against a team like Chelsea, was a very good for us and we are very happy. The result keeps us in the top half of the table, which is good, and it was a wonderful feeling to win this game, a London derby, in front of our fans at home.

"Our fans were unbelievable again. They were behind us, always pushing us and I am glad for them we won this big London derby game."

Such was the devastation Diame caused to Rafa Benitez's team when he came on to the pitch that many asked why the Senegal midfielder had not started the match. However, Diame explained that it was a decision by manager Sam Allardyce that he was happy with and that it had worked well.

"I was feeling the effects from the last few games. The last couple of games have been close together this week and so the gaffer decided to rest me a bit and put me on the bench. I felt this was good and I would benefit from this, because I had my energy back again when I came on."

Diame said Big Sam had given him simple instructions when he went on alongside fellow team-mate Matt Taylor at half-time.

"The gaffer asked me to get on the pitch to do my best and to try to drive the ball forward and help create more opportunities for our team. He said to me just to go and make something happen, to help with the attack, to help us as a team to have more confidence to attack Chelsea, which we did. We came together to do that in the second half.

"I tried to get in everywhere to do something, make things happen and we did that and think we deserved our victory over Chelsea."

Diame said confidence is high after victory over the UEFA Champions League winners and that the team want to take this into the next match against Liverpool at the Boleyn Ground on Sunday.

"We have a lot of confidence and we worked hard, the two defeats [against Tottenham Hotspur and Manchester United] didn't affect us in a negative way, we just worked hard because we know what we can do. This result gives us a lot and we must take that into when we play Liverpool in the next match."

West Ham TV