Pep Guardiola says Sergio will be sidelined for 'a few weeks' with his muscular injury. Aguero came off 13 minutes from the end of Saturday’s Premier League win over Chelsea with a thigh injury. Speaking at his pre-match press conference ahead of Tuesday’s latest Champions League group game against Shakhtar Donetsk, the manager revealed he expected our top scorer to be out for ‘a few games’ And he confirmed that he expected our all-time record scorer to miss the Etihad derby with Manchester United on December 7th. “(Sergio will be out for) a few games - I don’t know exactly,” said Guardiola. “It will be a few weeks, exactly how many I don’t know. “He has a tendon problem in front –so it will be a few games out. "(Will he be fit for) the derby?I don’t think so, maybe we have a miracle but I don’t think so. "We will miss Sergio, we have had some problems with injuries but we will wait for him and meanwhile we have Gab and Sterling who can play in that position. We will live without him for a while.