Bayern spokesman Markus Hoerwick says Schweinsteiger felt discomfort in the knee on Tuesday but there is no tendon damage.
Schweinsteiger, who recently missed more than two months due to a broken collarbone, hurt the same knee last week.
Any possible absence of Schweinsteiger would be a blow to Bayern, with central defender Daniel van Buyten set to miss two months with a broken foot.
Schweinsteiger played as Bayern lost 3-1 at Borussia Moenchengladbach on Friday to drop into a three-way tie atop the Bundesliga.
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