The winger has a slight sprain of the inner ligament in the left knee and could be out for up to two weeks.
Petrov was with his national squad preparing for a couple of friendlies when he was forced to return back to City’s Carrington training ground, where he is now undergoing rehab work.
The 30-year-old has enjoyed a fine season so far, scoring three times for the Blues and being named as the fans’ player of the month for October, despite not commanding a regular starting place on the left flank.
Petrov has been on fire all season.
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Manager Mark Hughes is sure to be keeping a keen eye on this week’s remaining international fixtures as he prepares for this weekend’s visit to Anfield.
Beyond that comes a busy seven days around the turn of the month, with the league games against Hull and Chelsea book-ending the visit of Arsenal for the Carling Cup quarter final. Tickets for that game are now on general sale at just £20 for adults and £1 for under 16s. See if anyone you know is going on Facebook.
