Manchester United’s star defender has been a formidable figure since his £30m summer move from Villarreal. But the Red Devils’ August Player of the Month appeared to add to Mourinho’s problems on Sunday. Bailly was withdrawn in the 52nd minute of United’s 4-0 drubbing by Chelsea after challenging with Eden Hazahttp://cdn.images.express.co.uk/img/dynamic/67/590x/Bailly-724799In the aftermath to the Chelsea defeat, Mourinho said: “He’s injured and I’m afraid he’s badly injured. In his knee, in the ligament area, he feels it is really bad.” However, according to The Times, tests conducted by United’s medical staff have shown the blow is not massively serious. It is suggested Bailly could be out for less than six weeks, which would see him return in December.jpgrd.http://cdn.images.express.co.uk/img/dynamic/67/590x/secondary/Bailly-tussle-695843.jpg http://cdn.images.express.co.uk/img/dynamic/67/590x/secondary/Mourinho-return-695844.jpg Even with the boost, the 22-year-old is expected to miss games against the likes of Arsenal, Feyenoord and West Ham, while he will certainly miss tomorrow’s EFL Cup tie with Manchester City at Old Trafford (8pm). Chris Smalling’s fitness is being monitored after he was rushed back for the Chelsea clash, meaning Mourinho could be short of defensive options when City visit. But Bailly’s injury time frame was feared to be far longer than what scans have shown.