"It would be absolutely brilliant if he could get his first cap some time during the Greece game," says Glenn.
He feels Trevor could at least get a place on the bench and adds: "I don't see why not if he impresses in training this week - I would imagine everyone has got a chance to be included.
"I would think if Trevor has a good week's training, if he is not to start the game, then he could creep onto the bench and get on to the field of play at some time during the game.
"I wouldn't have thought he was called up just for the experience at his age; I think he is there because if Mr. Eriksson thinks he needs to call on Trevor he will be up to the job."
His flexibility could be an asset, thinks Glenn, and he adds: "He can play in two or three different positions, right side, left side, and that is quite healthy especially when you think about the substitute situation.
"I definitely see him as a wide midfield player, and he is strongest coming down the right side but it is not a problem for him to play on the left, cutting in on his favoured right foot.
"He can play balls into strikers, keep going, get the ball back and end up in the midfield."
The selection of Trevor, according to Glenn, proves that Eriksson has an open mind about which clubs his players play for.
"It just shows you if you play well enough to impress the England coach you don't have to be at Manchester United or Arsenal to get in the squad," he says.
"It is a great honour for Trevor first and foremost, and also a great honour for the club."
It is also a tribute to the way he worked so diligently to get fit in the summer, and Glenn adds: "He has worked very hard for this call-up, particularly through the summer when he was overcoming the knee injury from last year, and it is fully deserved.
"We have been impressed with the way he kept at it in the summer; I don't think he took a holiday, and John Green and the medical staff have got to take a lot of credit.
"I know John worked personally with Trevor during the summer and it must be gratifying for him to see Trevor called up."
Glenn also praised Harry Redknapp for bringing him to the club when he appeared to be losing his way at QPR.
"Harry must take all the credit for getting Trevor to the club and overall he has done very well since he has been here," says Glenn.
Although a large number of his squad are away on international duty, he says the thought of 'shutting up shop', as some clubs do in this period, has not entered his head.
"It is not my style - there is too much work to be done," he insists.