"When Trevor Sinclair departed it left us completely short of any natural width at all and certainly short of a left-sided player who is naturally left-footed," says Glenn, following the sealing of the transfer which sees Fredi Kanoute go to Spurs and Matthew and £3.5m come the other way.
"There is only Rufus Brevett in the whole club who is left-footed and we didn't have any balance in the team at all," he says.
"I am hoping that Matthew will give us that balance on the left and it is good to secure a player that is only 22-years-old.
"He has had three years or so at Tottenham and has made 60 odd appearances, I believe, in terms of starts in the Premiership, not including his substitute appearances.
"So he has had a taste of the Premiership football as well as international football with England under-21s.
"I would like to think that with regular football now on a weekly basis he will be confident that he is going to play, because at Tottenham he never had that confidence.
"He said to me: 'Glenn, I could often have a good game at Tottenham and I knew I would be out the next week if a senior player was fit again.'
"That is understandable at times but also from the young player's point of view it doesn't help their confidence - now he knows that if he is doing well he will get a run in the side.
"I have done my homework and I am happy that he is a self-motivated young man who can add to the club.
"We have had a long chat about football and he said all the right things. Now he wants to settle in as quickly as possible.
"He has been involved in every one of Spurs' pre-season games, he likes our 4-4-2 system, and he knows his role in the club.
"Hopefully he can supply the ammunition for Jermain Defoe, David Connolly, Don Hutchison coming in at the far post, and the striker we would like to think we will sign."
As for that, Glenn adds: "It would be unfair on the club to say who the player is but it is another young player at a top, top Premiership side and I am pretty excited about it.
"There is no chance that he will be sold to us or to anyone else but I have already said too much - hopefully, the player I have in mind will produce lots of goals for us."
Of Fredi's departure, Glenn adds: "It is always disappointing to lose a player of Fredi's calibre. He has given good service to the club.
"It was disappointing for ourselves - and him - that he was injured for six months last season, but it was a genuine injury.
"It was in a challenge with Robert Huth at Stamford Bridge, and a very unforeseen problem - without doubt Fredi not being fit until near the end of the season had an adverse bearing on our final position in the Premiership.
"I wish him well and I have enjoyed working with him; for the most part as manager I have missed the players that have left, having enjoyed working with them.
"There is always the odd one or two that you don't miss, but it is not that many."