Wayne Rooney is a major injury doubt for England's friendly with Egypt at Wembley on Wednesday.
Rooney came off the bench to score his 28th goal of the season and win the Carling Cup for Manchester United against Aston Villa on Sunday afternoon.
But Sir Alex Ferguson confirmed the 24-year-old was feeling slight discomfort in his knee afterwards.
Rooney will be allowed to join up with the England squad on Sunday evening but will be assessed by team medical staff before Fabio Capello knows whether he has his talisman available to face the African Nations Cup winners.
"He got a whack right away," said Ferguson after Sunday's triumph.
"He has been complaining a little about that for a few weeks and was holding it a bit today. In fact I thought we might have to take him off but he wanted to stay on so it was good.
"The doctors are assessing it and I don't know what England are going to do."
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