The former Bayern centre back will not be able to face his former team if he fails to recover from the injury picked up against Hoffenheim on the final day of the Bundesliga season.
Dortmund are already battling to get Mario Gotze fit in time for the match next week.
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Being an amiable guy is good for you and Jurgen Klopp is living proof.
Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.