The Daily Mail reports that United have already begun negotiations with Mainoo's representatives, with the Red Devils determined to keep the England international for a long time. The player's representatives are demanding that United raise his wages to £ 180,000 per week plus bonuses.
DID YOU KNOW?
Mainoo has been out with a muscle injury since early February, having last featured against Leicester in the FA Cup fourth round.
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WHAT NEXT FOR MAN UTD?
Mainoo has been ruled out of United's match against Real Sociedad in the Europa League on Thursday.