Everton boss Dave Moyes says young striker James Vaughan needs to be patient.
"He has missed a lot of football and, even this season, he missed the first three months with a dislocated shoulder," Moyes told the Daily Express.
"What James has is that infectious attitude, enthusiasm, aggression and now we need to teach him a bit more about the game. If we do that, then he has a good future."
Vaughan and fellow teenager Victor Anichebe have found their path to the Everton side blocked by the likes of Andy Johnson and Yakubu Aiyegbeni, and Moyes accepts that it has become harder to integrate the young players.
He explained: "We have said to James Vaughan and Victor Anichebe that the standard is stepping up here and you have to step up with it.
"Both of them have to do that because the club is changing. It is a balancing act for me and it can be difficult."