The Germany international aggravated a back problem against Paraguay on Wednesday night and is not expected to return for the Bundesliga runners-up until next monthBorussia Dortmund midfielder Ilkay Gundogan has been ruled out of action for a fortnight with a back injury.
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Further tests upon his return to Dortmund's training ground have clarified the issue and he is expected be sidelined until the end of August, meaning he will miss Bundesliga clashes with Eintracht Braunschweig and Werder Bremen.
A statement on the club's official website read: "Borussia Dortmund midfielder Ilkay Gundogan is expected to be out for two weeks after limping off during Germany's friendly against Paraguay on Wednesday night.
"His back problems, which are a result of a spinal compression, have increased, according to BVB team doctor Markus Braun."
Gundogan will be hoping he can make a full recovery in time for Jurgen Klopp's men's trip to Eintracht Frankfurt on September 1, before another international window opens up.