Bulgaria international Dimitar Berbatov may be forced to endure exploratory knee surgery, according to Manchester United manager Sir Alex Ferguson.
Berbatov was surprisingly left out of the United squad for Saturday's 1-1 draw with Birmingham City at St Andrew's, but Ferguson explained the striker's dilemma after the game.
He said: "Dimitar wanted to play with it but we felt we should try to get it (the knee) sorted and get him fit again. He may have to have an exploratory operation."
Of his side's display after Darren Fletcher has been sent off, Ferguson added: "We were down to ten men for the last part of the game but in the first half we played absolutely brilliantly and dominated the match.
"It was a travesty to go in at half-time 1-0 down after they scored with their first attack. It was a sickener but it's important not to let your head go down. We kept battling away and deserved a point.
"We spoke about remaining patient at half-time because 45 minutes is a long time.
"We've won so many games late on so we shouldn't worry about being 1-0 down. We've faced that situation many times."