Manuel Neuer limped out of Bayern Munich's 4-1 Bundesliga victory over Fortuna Dusseldorf on Sunday.
With his side up 2-0 early in the second half, the Germany international pulled up after slipping while attempting to make a pass.
Neuer had come out to clean up a stray ball and send it back to his team-mates, but seemed to indicate immediately that he would not be able to continue.
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Sven Ulreich was summoned from the Bayern bench, while Neuer walked off under his own power, handing the captain's armband to Thomas Muller.