Aguero fell awkwardly following an early challenge by Nathaniel Clyne. It was quickly obvious the Argentina was in some considerable pain and although he indicated a desire to continue, medical staff quickly decided the damage to his knee would make it impossible.
Mancini confirmed it will be 48 hours before City can make a proper diagnosis. However, as with all such injuries, the fear Aguero may have damaged his cruciate ligaments is obvious.
Mancini said: “I am worried. We don’t know how serious it is. We need to wait maybe two days for the scan. But usually the knee is dangerous. The injury was so strange because it was not a bad tackle.” Mancini conceded that if the worst is confirmed later this week and Aguero is ruled out for an extended period, he may have to ‘change his squad building plans’.