The teenager has been backed to come good by England U21 boss Stuart Pearce after he scored the winner against Norway on Monday.
Pearce said: "It is important not to elevate these players to a God-like status too soon and certainly not write them off too soon. We have a tendency in this country to do so, but an even ship and a steady progression would be more beneficial.
"Connor is still only 19. The big problem is Connor hasn't played a great deal of first team football. Physically, this is quite demanding. The good thing is football of a good standard will benefit Connor and his club."