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Manchester City manager Manuel Pellegrini said the club are trying to understand why captain Vincent Kompany is suffering from calf injuries.
Kompany made his return to the City line-up against Sunderland on Boxing after having missed their past five Premier League fixtures.
However, the Belgium international was forced off the pitch after just nine minutes with a recurring calf issue.
"We are trying to understand why he has so many injuries to his calf," said Pellegrini after the 4-1 win over Sunderland.
"We are going to do all the tests he needs to understand why."
City face league leaders Leicester City on Tuesday.
