The England midfielder is expected to be sidelined for at least two weeks with the injury, which occurred when his right ankle gave way when landing on the Astroturf at the side of the Old Trafford pitch during the semi-final penalty-shoot out defeat. Initial tests suggest he will be out for up to a month, forcing him to miss the Premier League clash at Arsenal on Feb 12 and potentially the Champions League last-16 first-leg tie against Olympiakos in Athens 13 days later.