Bayern Munich are waiting on the fitness of defender David Alaba for Tuesday's Champions League home match against Olympiakos after the Austrian picked up an ankle injury.

Having opened the scoring in Bayern's 3-1 win at Schalke 04 on Saturday as Pep Guardiola's side went eight points clear at the top of the Bundesliga, Alaba injured his left ankle and had to come off in the 83rd minute at the Veltins Arena.

A scan in Munich on Sunday revealed the extent of the injury and whether or not Alaba faces the Greek champions at the Allianz Arena depends on how the injury heals in the coming days.

Bayern are top of Group F, but level on nine points with Olympiakos, and a draw at the Allianz Arena would send both teams into the draw for the knock-out phase.