Gary and Phil Neville are both said to be affected, as are Keano, Giggs and Rooney.
“We have had a bit of a bug around the place for a while and Carlos [Queiroz] is still bothered with it and has not fully shaken it off. Wayne Rooney has had a bit of it and now Gary and Phil. Roy Keane has had it as well as a few others so we just hope it clears up quickly,” said Sir Alex Ferguson.