Manchester - Manchester United manager Louis van Gaal says Robin van Persie has a right ankle injury that will keep the striker out for a "long time."
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Van Persie was hurt in United's 2-1 loss at Swansea last Saturday and left the Liberty Stadium on crutches, with a protective shoe on his foot.
Van Gaal says Van Persie will miss Saturday's Premier League match against Sunderland and says an "ankle problem takes a long time - it's not one week or two weeks."
Van Persie is set to miss a league game at Newcastle on Wednesday and the FA Cup quarterfinal match against former club Arsenal on March 9.
Defensive midfielder Michael Carrick is fit to return from injury against Sunderland.