He said: "I believe he's one of the best right-backs in this country. I think he's quality. He can be a great player. If I was Capello, I would have no problem playing him whatsoever.
"It's down to him at the end of the day, but we play him for Portsmouth and he's been fantastic for us all season. I suppose I'm a little bit biased working with him, but I'm looking up and down the country at the right-backs that are English and he's got to be right up there. I don't see many better to be honest with you.
"The thing we showed him was love and if Capello wants to play him, he's got to believe in him and put him in the team and say "you're my right-back so go and deliver" - and I think he could. That's the thing with Glen, he's a confidence player.
"At Portsmouth, we look after him, he knows he's one of the top players at the club and that gives him the confidence. By playing him for England, the manager would be doing the same."