Bayern Munich midfielder Bastian Schweinsteiger has cut short a training session because of a recurring problem with his left knee.
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.