World Football Injury Tracker
The 24-year-old, who has scored 10 times this season, picked up the injury during a Premier League win over Stoke City on New Year's Day.
City manager Roberto Mancini had been hopeful that the Argentinian would be available for the FA Cup win over Watford on Saturday, but the forward, who is recovering in Italy, has not been set a date for his return.
Here we look at the progress of leading players currently on the treatment table at their clubs.
John Terry and Petr Cech, Chelsea
The former England international had been expected to return to action at the start of December but remains sidelined.
The Czech Republic international is currently being replaced by Ross Turnbull, who came on at halftime for the 30-year-old at Goodison Park.
The absence of Cech from the team has lead to Benitez considering investment in a new goalkeeper for the squad, claims The Independent.
Wayne Rooney, Manchester United
The England international damaged a ligament behind his knee during training on Christmas Day and has not played since for the Old Trafford club.
The injury also means the 27-year-old will not feature in the Premier League match against Liverpool at Old Trafford on Sunday.
Rooney scored twice in the corresponding fixture last season as United ran out 2-1 winners.
Jose Enrique, Liverpool
The 26-year-old full-back had been in good form for Brendan Rodgers' team this season before the injury.
The Spanish full-back will be missing for a series of crucial Premier League matches, including trips to Manchester United, Arsenal and Manchester City.
Holger Badstuber, Bayern Munich
The 23-year-old has already undergone surgery for the injury and is expected to be sidelined for six months.
The Germany international had only been back in action for a few weeks after a hamstring problem when he suffered his current long-term injury.
Claudio Marchisio, Juventus
The 26-year-old Italy international was limping with 15 minutes remaining but had to stay on the field after Juve had used up their allotted three substitutions through the game.
Marchisio, who had already picked up a hefty blow from a challenge with Eder, collapsed to the ground in agony when the final whistle blew at the Juventus Stadium. Fears of a long-term absence were allayed by an MRI scan which revealed only heavy bruising.