The 27-year-old was injured in their 0-0 draw against BotevPlovdiv on Thursday, a result that saw them advance in theEuropa League on away goals from the first leg.
"The first diagnosis is a suspected torn ligament. Therewill be further tests to determine the exact damage," the clubsaid in a statement. "But if the initial diagnosis is confirmedthen unfortunately the defender will be out for several weeks.
Stuttgart, who boosted their squad with a string oftransfers in the close season, kick off their Bundesligacampaign on Sunday with a trip to Mainz 05.
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