Wayne Rooney
Wayne Rooney has been told he has 12 months to prove his worth to new manager David Moyes. [Reuters]

With Manchester United adamant not to sell him off despite Chelsea coming up with a fresh offer, Wayne Rooney may submit transfer request to his club of nine years, as he is keen to move out of Old Trafford, according reports.

The 27-year-old England striker, who still has two more years with Manchester United under his current contract, has been linked to Arsenal, Chelsea, Barcelona, Real Madrid and Paris Saint-Germain ever since former coach Sir Alex Ferguson claimed that he had requested to leave the club.

Manchester United rejected Chelsea's fresh £25m plus offer for Rooney on Sunday but the England striker is keen to leave Old Trafford and is considering submitting a formal transfer request, according to a report by BBC.

Chelsea had earlier offered £20m for Rooney but was turned down by Manchester United. United manager David Moyes has been maintaining that the club's striker is not for sale but that didn't stop Chelsea manager Jose Mourinho from trying to bring him to Stamford Bridge.

Rooney's desire to leave Old Trafford seems to have increased after David Moyes stated that they would need him in case Robin van Persie is injured, clearly hinting his secondary role in the club where he has been playing for nine years.

"Overall, my thought on Wayne is, if for any reasons we had an injury to Robin van Persie, we'll need him," Sky Sports had quoted Moyes as saying.

"Wayne can play up on his own, he can play dropped in. It's going to be a time to see how I work with Wayne. Manchester United isn't about Wayne Rooney. Manchester United is about the team - the club. I won't allow Wayne Rooney to become more important than the football club and the football team, because that's the heart of it," he added.

Meanwhile, Chelsea defender Ashley Cole has reportedly told his England team-mate, Rooney not to miss the opportunity to work with former Real Madrid coach Jose Mourinho.

"I jumped at the chance. He's a great manager. He's proved how good he is with the number of trophies he's won with different teams. He's great at motivating players and keeping you on your toes, keeping you doing what you should be doing," Cole told The Sun.

"For me, if there's a player who wants to come to Chelsea, it would be one thought in my mind - to come here and to be under a great manager. It's a pleasure to play under him."