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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.