London: Manchester City manager Manuel Pellegrini admits it's impossible to know how long knee ligament injury victim Sergio Aguero will be sidelined after the star striker hobbled off in the 1-0 win over Everton.
The Argentina international, the Premier League's top scorer with 14 goals, limped out in the second minute when he jarred his knee as he stretched for the ball in a challenge with Muhamed Besic.
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