Milner admits the young striker isn't short of self-belief
“Rhian has probably is more outgoing and has got more confidence than I had," said Milner, 33, to the Liverpool Echo.
“I think I had an inner belief and a quiet belief in myself whereas Rhian lets everyone know.
“That is fine as long as you are learning and you have that arrogance on the pitch, which he does, but then off the pitch he is the other side.
“To come in here and score goals in pre-season is great and it has given him a lift but now it is the start of it.
“He has got a great squad around him, he has learned off the manager and he needs to take everything in every day. Every day is an opportunity to prove himself and improve again."
Milner added: “It's a long path to get there and he is in among it straight away. If he wasn't as grounded as he is that could be a problem but the good thing is he is and he has got hunger.
“And if he doesn't have that and maybe wobbles for one second he has got plenty of senior players around him that will give him a kick up the a***."