Bayern Munich midfielder Corentin Tolisso left the field "in a lot of pain" as his side beat Hamburg 6-0, according to coach Jupp Heynckes.
The 23-year-old was introduced as a second-half substitute during Bayern's rout of their relegation-threatened visitors before he was involved in a collision with Hamburg's Vasilije Janjicic.
Both players suffered shin injuries but Tolisso's were serious enough that he had to be assisted off the field by medical staff, and Heynckes said he was waiting on an update on the France international's condition from club doctor, Hans-Wilhelm Muller-Wohlfahrt.
"Both players clashed shins," Heynckes told reporters.