Nkunku
The French forward went down clutching his leg after a challenge in the ninth minute of the 1-1 draw, but Chelsea boss Mauricio Pochettino refused to blame the state of the pitch, which was less than ideal following the concert.
The 24-year-old Nkunku, formerly of Paris Saint-Germain, is one of the leading scorers in the German Bundesliga this season with 15 goals.