Pau Koubarsi left the field hurt during the Barcelona versus Real Madrid game. The Barcelona defender went down with what looked like a muscle problem after 57 minutes of play. Hans Flick acted fast to bring Andreas Christensen onto the field as his replacement. Medical staff helped Koubarsi off the pitch during the round 35 La Liga match at home. Doctors will check him soon to learn how bad the injury is and how long he might miss games.