Sergio Aguero
Sergio Aguero of Manchester City reacts after sustaining an injury during their English Premier League soccer match against Everton at the Etihad Stadium.Reuters

Manchester City have been dealt with a big blow as their in-form striker Sergio Aguero has reportedly been ruled out for a month with a knee ligament injury.

The 26-year-old old Argentine, who is currently the leading scorer in the Premier League with 14 goals from 14 appearances, picked up the injury during Manchester City's 1-0 win over Everton on Saturday.

The former Atletico Madrid striker, who was in tears as he left the pitch on Saturday, is yet to undergo a scan due to the swelling, but the Guardian reports that Aguero has damaged the lateral ligament of his left knee, and will be out of action for at least a month.

Despite admitting that the Aguero's injury comes as a big blow to City, manager Manuel Pellegrini insists that his side can manage without the Argentine.

"We would prefer to play with Sergio but, if he cannot play, we must try to continue the same way we have been playing in the last week," the Chilean told the Guardian.

"Remember, last season we played a lot of games without Sergio – and these are the same players and the same team. So I hope we can recover from this important injury but we have a good squad and we will see how we can do it."

Pellegrini also dismissed suggestions that City are a one-man team and their form will now start dipping, with Aguero facing a lengthy spell on the sidelines.

"It is one thing that a player can be in a very good moment as Sergio was until today but I don't think he has carried us. We have beaten a very difficult team like Everton without Sergio, without Silva, without Kompany, without Jovetic and with Dzeko only able to play 20 minutes.

"Every big team must have important players like Sergio. I suppose Ronaldo is very important for Real Madrid, Messi is very important for Barcelona but neither of those teams are all about just one player."

With Stevan Jovetic (hamstring) and Edin Dzeko (calf) also not a hundred percent fit, Manuel Pellegrini is currently facing a striker crisis as he prepares his side for their crucial Champions League clash against Roma on Wednesday.

Still the former Real Madrid boss is adamant that Manchester City will do well on Wednesday.

"The confidence is very high in this moment for the whole team but the injuries mean it is not the best way to approach such an important game as Roma," he said. "But I have confidence in this team and I hope we will do it in the same way that we have won these last five games."