Thomas Muller suffered a bruise thigh in Bayern Munich's DFB Pokal victory on Tuesday.
Muller was involved in a collision in the play that led to Bayern's opening goal, and though he tried to continue he was eventually replaced by Corentin Tolisso after 32 minutes.
Coach Jupp Heynckes said the substitution was only a precaution after Bayern's 6-0 quarterfinal win at Paderborn.
"Muller has a bruised thigh so we'll have to see how the injury develops over the next few days," he said. "He could have...