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DORTMUND, GERMANY - DECEMBER 17: Ilkay Guendogan of Borussia Dortmund is challenged by Robin Knoche of VfL Wolfsburg during the Bundesliga match between Borussia Dortmund and VfL Wolfsburg at Signal Iduna Park on December 17, 2014 in Dortmund, Germany. (Photo by Dennis Grombkowski/Bongarts/Getty Images)

DORTMUND, GERMANY - DECEMBER 17:  Ilkay Guendogan of Borussia Dortmund is challenged by Robin Knoche of VfL Wolfsburg during the Bundesliga match between Borussia Dortmund and VfL Wolfsburg at Signal Iduna Park on December 17, 2014 in Dortmund, Germany.  (Photo by Dennis Grombkowski/Bongarts/Getty Images)