Manchester United boss Sir Alex Ferguson faces another injury blow with Dimitar Berbatov tipped to be out for three months.

The Sun says Berba needs knee surgery which will rule him out for three months.

Manchester United's Bulgarian striker has a ligament problem.

Berbatov does not have to go under the knife straight away. But he has been playing through the pain barrier and surgery in the near future is deemed inevitable to solve the trouble.

It is another blow to boss Alex Ferguson, who has endured a spate of injuries this season. But it could mean more games for Michael Owen and lift his World Cup bid.