Winger Arjen Robben is recovering from a minor muscle problem and will miss Tuesday's Champions League match in Belarus against BATE Borisov, the Bundesliga club said.
Dutch international Robben did not play in Bayern's 2-0 league win over Werder Bremen on Saturday but his absence was not felt as the Bavarians cruised to their sixth win in six league games.
Bayern, who opened their Group F campaign with a 2-1 victory over Valencia, have won nine straight games in all competitions this season.
"We want to have a perfect start in the Champions League as well," captain Philipp Lahm told reporters at Munich airport as the team departed on Monday.
BATE stunned Lille 3-1 away in their first game.