Bayern Munich have confirmed that defender Lucas Hernandez suffered ligament damage when he injured his ankle in the 3-2 Champions League win over Olympiacos.
Hernandez was forced from the field before the hour mark in Greece in a fresh blow to Bayern's thinning defensive stocks.
The left-sided France international faces "several weeks" out, sporting director Hasan Salihamidzic said on Tuesday, although the club have not confirmed an exact timescale.
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The latest in a series of injury problems for 23-year-old Hernandez comes less than a week after first-choice centre-back Niklas Sule underwent surgery on a torn anterior cruciate ligament.