That figure is half what they would have expected for the England star a year ago.
Rooney, 27, was sensationally axed from United's Champions League starting line-up against Real Madrid on Tuesday night.
And with just over two years left on his current contract, the club are ready to accept a reduced fee.
United believe they have seen the best years from a player they signed from Everton for £30m nine years ago.
Is time running out for Rooney? Where should he go? Give us your shout below...