Forster has three matches remaining of his loan spell from Newcastle and Norwich fans are set to hail him a hero as he returns home next month.
He is set to be named "Supporters Player Of The Season" after making 39 appearances for City.
Paul Lambert: "I don't think there is a better under-21 goalkeeper going, I really don't.
"I get asked the question regularly. I am not telling anyone how to do their job, that's for somebody else to do it, but in my view there's not a better one about.
"I think he will be world class - and that's not putting pressure on the kid because I think he has been colossal. If there is a better one there, I'd like to see him.
"Try to keep him? Newcastle have just been promoted, he's going back into the Premiership.
"You don't know what's going to happen.
"They've got a terrific goalkeeper themselves up there at the moment, a couple, but their goalkeeping coach at Newcastle rates him highly. So do I, because I think he has been brilliant. It's just a pity he's not Scottish."