The England striker was benched for Tuesday's Champions League clash against Real Madrid at Old Trafford, which United lost 2-1 and crashed out of the competition losing 3-2 on aggregate.
Sir Alex Ferguson's decision to leave Rooney on the bench stunned United supporters but the manager feels the player has not been dealing with fitness issues which have been troubling him since the start of the season.
The striker enters the final two years of his contract this summer and is currently United's highest earners with £250,000-a-week in wages. Rooney tried to leave United nearly two-and-a-half-years ago citing lack of ambition from the club but changed his mind and signed a lucrative contract to extend his stay.
Ferguson signed Rooney nine years ago from Everton for reportedly £24million and is now ready to sell the striker for less than his transfer fee.
The relationship between the Ferguson and Rooney has been sore according to evidence at the Carrington traiing ground. The striker hasn't been in perfect shape since pre-season and has gone through several injuries this season.
The arrival of Robin van Persie and the rise of Danny Welbeck has reduced Rooney's chances upfront, but the striker has been moved to a more defensive role in midfield or play behind the striker. Rooney has managed to score 14 goals in all competitions this season.
Top European clubs like PSG, Real Madrid, Chelsea and Manchester City are lining up a move for Rooney and are a few list of clubs ready to match his massive wages.
City tried to buy him back in 2010 but United had to break their wage structure to keep Rooney. Ferguson will demand more from striker during the rest of the season, but if Rooney fails to deliver it could be his last season at Old Trafford.