Sir Alex Ferguson believes Manchester United will be seeing the best of Wayne Rooney in two years' time.
Rooney is currently entering his sixth season with the Red Devils after joining from Everton for £25.6million in 2004.
Although the striker has enjoyed great success at Old Trafford he is yet to establish himself as Sir Alex Ferguson's premier striker.
Ferguson believes there will be greater expectation on Rooney's shoulder this season, not only due to Carlos Tevez and Cristiano Ronaldo's departures, but because it is a World Cup year.
Rooney is a certainty for Fabio Capello's England squad for next summer's finals if the Three Lions qualify and Ferguson believes there is more improvement to come from the 23-year-old.
Expectation"There will be an expectation about Wayne Rooney this season purely because he is English," Ferguson said.
"Without question he is the main striker that England's hopes will be pinned on at the World Cup, so that is where the expectation is all coming from.
"But I would like to see the boy develop his game in a lot of departments.
"He is 23 now. You will get the maturity when he gets to 25. Then there will be a more consistent nature to his game."
Ferguson has acknowledged Rooney needs to add consistency to his scoring, although he believes with maturity he will deliver with more regularity.
"A lot of players go on little runs of scoring three or four in a row, then they have a couple of weeks off, come back and score five in a row," he continued.
"Wayne has periods like that. He has a little bit to do to get rid of it. That is where the maturity side has to come into it.
"He has the hunger and the natural ability to do a lot of these things. All he has to do is show the maturity to get there."