Bayern Munich have confirmed that defender Niklas Sule tore the anterior cruciate ligament in his left knee during their Bundesliga draw against Augsburg.
Germany centre-back Sule will undergo surgery on Sunday after scans confirmed head coach Niko Kovac's fears of a serious injury.
Sule, 24, went down clutching his left leg after going into a challenge with Florian Niederlechner in the early stages of the 2-2 draw in Bavaria.
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The defender walked from the pitch but Kovac admitted to having "a very bad feeling" and the most important pillar of his back four now faces several months on the sidelines.