Wayne Rooney says he will improve as a player thanks to the presence of fellow Manchester United striker Dimitar Berbatov.

The England international has welcomed the arrival of Berbatov from Tottenham, but even though he believes the Bulgarian's experience can help him reach greater heights, Rooney is adamant that he cannot now take his place in the starting eleven for granted.

"The mere fact he is at Old Trafford should take me onto a different level," Rooney told United's official website.

"I am not guaranteed my place in the side anymore."

With Argentina star Carlos Tevez also vying for an attacking berth, Rooney went on to explain that with Berbatov leading the line he is looking to prosper even further with the Red Devils.

"More than anything I like playing just off a front man," said Rooney.

"It's probably because I get on the ball more. I don't like to be out of the game too long.

"Some centre-forwards can stay up front, not touch the ball and just look to score goals. I don't really enjoy doing that.

"I like to be involved in the game. Mainly at United I have been used in different roles but maybe the fact Dimitar has arrived will bring some continuity to my game."

Having been criticised in some quarters for a slow start to his season, Rooney has hit back by scoring in his last three outings for United.

It's a challenge the 22-year-old has been relishing.

"I like to play under pressure," he explained.

"The other week when the manager left me out against Bolton, I was disappointed. I just wanted to get on the pitch as quickly as I could and show him what I could do.

"I like to prove people wrong if I can."