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DORTMUND, GERMANY - JANUARY 23: Kevin Grosskreutz of Borussia Dortmund during a training session at Borussia Dortmund training center on January 23, 2015 in Dortmund, North Rhine-Westphalia, Germany. (Photo by Alexandre Simoes/Borussia Dortmund/Getty Images)

DORTMUND, GERMANY - JANUARY 23:  Kevin Grosskreutz of Borussia Dortmund during a training session at Borussia Dortmund training center on January 23, 2015 in Dortmund, North Rhine-Westphalia, Germany.  (Photo by Alexandre Simoes/Borussia Dortmund/Getty Images)