Pep Guardiola says Kevin De Bruyne will be checked over by Manchester City doctors after the Belgian injured his knee in the 2-0 Carabao Cup victory over Fulham on Thursday night.
De Bruyne was substituted late on after Fulham's Timothy Fosu-Mensah fell backwards onto his knee.
The 27-year-old appeared to be in some discomfort and walked gingerly from the pitch. Upon being substituted he seemed to indicate to Guardiola that he had suffered an impact injury, before heading down the tunnel.
De Bruyne missed 10 matches with a knee ligament injury earlier this season, though that was his right knee and on Thursday he appears to have injured his left.