The 20-year-old has only featured in one competitive game for the Citizens since joining from Inter in a reported €30 million move this summer, were he picked up the injury in the 1-0 win over Timisoara in a Europa League qualifier.
The player underwent surgery on his knee in mid-September and commented on his recovery.
"It's going to be around six to eight weeks," he was quoted as by Reuters at Manchester airport.
"Everything is OK. I'm calm about it."