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DORTMUND, GERMANY - AUGUST 04: (L-R) Oemer Toprak, Dan-Axel Zagadou, Macimilian Philipp and Mahmoud Dahoud pose as the new players during the Borussia Dortmund Season Opening 2017/18 at Signal Iduna Park on August 4, 2017 in Dortmund, Germany. (Photo by Christof Koepsel/Bongarts/Getty Images)

DORTMUND, GERMANY - AUGUST 04: (L-R) Oemer Toprak, Dan-Axel Zagadou, Macimilian Philipp and Mahmoud Dahoud pose as the new players during the Borussia Dortmund Season Opening 2017/18 at Signal Iduna Park on August 4, 2017 in Dortmund, Germany.  (Photo by Christof Koepsel/Bongarts/Getty Images)