Wayne Rooney is doubtful for Manchester United's home game in the English Premier League against Sunderland on Saturday because of a groin injury and illness.
Interim manager Ryan Giggs said on Friday than several United players including Rooney have been suffering from a "bug."
Giggs, who replaced the sacked David Moyes last week, says, "Wayne has a tight groin also so obviously with the bug you have to be careful with that because his immune system is down."
Robin van Persie could make his return at Old Trafford after receiving treatment for a knee injury in the Netherlands.
United beat Norwich in Giggs' first game in charge but United is reportedly looking for a more experienced manager, with Louis van Gaal expected to land the job.