Aguero will be at least one month out with a calf injury

Sergio ' Kun ' Agüero will be at least one month down the calf injury he suffered this weekend in the game against Arsenal ( 6-3) , announced Monday the Chilean coach Manuel Pellegrini.

Aguero limped off the field five minutes after starting the second half at the Etihad Stadium, after having opened the scoring 14 minutes into the match .

A major concern is whether the England team Agüero , the challenge in the attack 'citizen ' , will be fit for the first leg of the knockout stages of the Champions League against FC Barcelona in late February .

" Sergio has a calf injury . Dr. who will tell you how many weeks be out ," Pellegrini , who explained that the Argentine will be " at least a month " out of the competition said.

The exdelantero sum ​​Atletico Madrid and 19 goals this season with blue sky shirt City, 13 and 6 in the English league in the Champions League .

The " Kun" , 25 , has been the main attacker of the ' citizens' in so far this season with the Spanish Alvaro Negredo , who came to Manchester last summer and has signed thirteen goals for the whole of Pellegrini.

The English team plays this season the knockout stages of the Champions League for the first time in its history , after two failed attempts to overcome the group stage of the first phase the last two seasons .