Sergio Aguero injury: Manuel Pellegrini admits Manchester City striker could be out for longer than first expected

Knee injury had been expected to keep Argentine star out for four weeks

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Sergio Aguero could be missing for longer than first thought after scans revealed the Manchester City striker suffered a twisted medial ligament against Everton.

The striker, who leads the Premier League's goal scoring charts with 14, was expected to miss up to four weeks but a scan has revealed an injury with a longer recovery time.

Aguero left the pitch in tears against Everton on Saturday evening, telling City boss Manuel Pellegrini he "felt something strange happen" in his knee.

Aguero's injury is reported to be similar to the one David Silva recently suffered - the Spaniard has not played since 29 October missing eight matches so far, though he could return against Roma on Wednesday.

Pellegrini has said he cannot be exact with the timescale.

"Well Sergio - we know he is injured. He cannot play tomorrow. He will see how long he will be out, but I think it is more important for us to think about the players we have available for an important game against Roma."

Pellegrini was then asked whether he was unclear about the duration Aguero would be out of action, to which he said: "We know, but it is difficult to know exactly how long he will be injured. It could be four, five or six weeks. It depends a lot on the way he recovers."

It will likely be left to Edin Dzeko to lead the line for the must-win Champions League tie against the Italians, though the Bosnian has struggled for form this term; after scoring 26 goals in all competitions last season Dzeko has just four this term, coming in back-to-back games against Sheffield Wednesday and Hull in September.

Edin Dzeko will likely start against Roma in Italy

City could have up to six players missing against Roma, although Fernandinho, Stevan Jovetic, Silva and, importantly, skipper Vincent Kompany could be back.