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Manuel Pellegrini has admitted Manchester City could be without star striker Sergio Aguero for up to TWO months.

Argentine hot-shot Aguero, 25, has been in outstanding form this season and scored his 19th goal in 20 games in the Blues' stunning 6-3 victory over Arsenal on Saturday.

But he had to go off in the second half of that match and left the Etihad Stadium on crutches, with his right calf in a protective plastic boot cast from the knee down.

And boss Pellegrini, after seeing his side beat Championship high-flyers Leicester 3-1 to reach the Capital One Cup semi-finals, said: "I am not a doctor, so it is very difficult.

"But the doctor has said he has at least one month or eight weeks. I don't know how many weeks but it will be at least one month."

If Aguero is sidelined for eight weeks, he could miss TEN league matches and Barcelona's visit to the Etihad on February 18 for the first leg of a Champions League last 16 tie.

Manchester City reached the League Cup semis as Edin Dzeko scored twice following Aleksandar Kolarov's brilliant free-kick opener.

The victory extended their unbeaten run to eight matches and sets-up an exciting 2014 ahead.

As well as Barca, City visit Championship Blackburn in the FA Cup on the first weekend of January, and aim to continue their challenge in the Premier League.

Pellegrini is after a clean sweep of all four trophies, adding: "It's always important to win every title. It is important for the team to have the winning mentality to try to win all competitions that we are playing."

Pellegrini will also assess full-back Pablo Zabaleta, who limped off in the 12th minute at the King Power Stadium with a hamstring injury.