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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As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?
Being an amiable guy is good for you and Jurgen Klopp is living proof.