Meanwhile, United striker Alan Smith seems increasingly likely to leave Old Trafford after Everton joined a long line of potential suitors.
Middlesbrough are understood to have offered £6 million, while Sunderland and Spurs have also been linked with Smith.
Smith joined United from Leeds for £7 million in 2004 and he has two years left on his deal but is expected to be sold before the start of the season if allowed to leave.