The Scot said: "I am biased because I work with Jack on a daily basis, but I would take him with England.
"England are already blessed with some top midfielders but if you are looking for one to go and be earmarked for the future then it is him.
"He is such a talented young English player, he has got an unbelievably rosy future. It is up to him how far he goes but he is getting better by the game.
"He is so pleasing to the eye on the ball, he sees a pass and there are goals in him, too. He will continue to get better and he is maturing as a person as well.
"There is no-one else around like him at 18. He has had that background at Arsenal and the more he plays the better he becomes.
"England know him well from the Under-21s. I saw his last game and he was terrific. He can really play, he is so composed."