Everton boss David Moyes says the next step will be the most difficult for Manchester United star Wayne Rooney.

Rooney has been in outstanding form for United, scoring 25 times this season, and he will be reunited with Moyes as the Barclays Premier League champions visit his boyhood club on Saturday.

Moyes said: "I think Wayne is a top player and I think he is going to be a great player.

"He has added goals to his game, maturity, understanding - all the things you would expect from a maturing player.

"I think time will be the test of whether he becomes the best in the world but he is certainly getting very close to it."