The German soccer federation said Sunday that Kroos is out with a left thigh injury and Hector withdrew with a neuromuscular injury. The 22-year-old Serdar has scored three goals in five Bundesliga games for Schalke. He played for Germany at the Under-21 European Championship in June.
Germany plays Argentina in a friendly in Dortmund on Wednesday before its European Championship qualifying game in Tallinn, Estonia, four days later.
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