Manchester City manager, Pep Guardiola is sweating on the fitness of Jack Grealish and Bernardo Silva. The duo limped off during their 3-1 win over FC Copenhagen in the Champions League on Tuesday. Grealish was substituted after only 21 minutes with a groin problem, while Silva sustained a heavy knock to his ankle in the second half. City face Chelsea at the Etihad Stadium on Saturday and face a crucial month in March with games against Manchester United, Liverpool, Brighton and Arsenal. “I didn’t speak with the doctor but it looks muscular with Jack. “The last few days his mood in training wa…