Emanuel Mammana is out for between 6 and 9 months

After undergoing a medical examination on the injury received in the match against Rostov, The Argentine defender has been diagnosed with an anterior cruciate ligament injury and will miss the remainder of the season.
Эмануэль Маммана пропустит от 6 до 9 месяцев. «Зенит» желает защитнику мужества и скорейшего восстановления
In the nearest future, Emanuel have an operation on the injury and his expected recovery time is 6 to 9 months. 

Everyone at the club hopes Emanuel will be back on the pitch as soon as possible and wishes him a speedy recovery.