Petrov undergoes knee operation

Petrov had just only returned from a hamstring problem

Manchester City's Bulgarian winger Martin Petrov has undergone knee surgery and is expected to be out for between three and four months.

The 29-year-old Petrov injured the meniscus in his left knee playing for Bulgaria in October.

City had delayed the operation in the hope that Petrov's injury could be cured by a bout of strengthening work.

But that approach failed to resolve the problem, prompting City to opt for the operation and lengthy rehabilitation.

606: DEBATE The blame here lies really with Bulgaria MSSBlueTrillions

Petrov had only just returned from a hamstring injury when he was injured on international duty.