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DORTMUND, GERMANY - DECEMBER 17: Illkay Guendogan of Borussia Dortmund challenges Naldo 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:  Illkay Guendogan of Borussia Dortmund challenges Naldo 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)

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KAISERSLAUTERN, GERMANY - MARCH 25: Ilkay Guendogan of Germany controls the ball during the International Friendly match between Germany and Australia at Fritz-Walter-Stadion on March 25, 2015 in Kaiserslautern, Germany. (Photo by Dennis Grombkowski/Bongarts/Getty Images)

KAISERSLAUTERN, GERMANY - MARCH 25:  Ilkay Guendogan of Germany controls the ball during the International Friendly match between Germany and Australia at Fritz-Walter-Stadion on March 25, 2015 in Kaiserslautern, Germany.  (Photo by Dennis Grombkowski/Bongarts/Getty Images)

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ST GALLEN, SWITZERLAND - JULY 25: Ilkay Guendogan of Borussia Dortmund runs with the ball during the preseason friendly match between Borussia Dortmund v Juventus Turin at AFG ARENA on July 25, 2015 in St Gallen, Switzerland. (Photo by Alexandre Simoes/Borussia Dortmund via Getty Images)

ST GALLEN, SWITZERLAND - JULY 25:  Ilkay Guendogan of Borussia Dortmund runs with the ball during the preseason friendly match between Borussia Dortmund v Juventus Turin at AFG ARENA on July 25, 2015 in St Gallen, Switzerland.  (Photo by Alexandre Simoes/Borussia Dortmund via Getty Images)

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DORTMUND, GERMANY - FEBRUARY 28: Ilkay Guendogan of Dortmund runs with the ball during the Bundesliga macth between Borussia Dortmund and 1899 Hoffenheim at Signal Iduna Park on February 28, 2016 in Dortmund, Germany. (Photo by Lars Baron/Bongarts/Getty Images)

DORTMUND, GERMANY - FEBRUARY 28:  Ilkay Guendogan of Dortmund runs with the ball during the Bundesliga macth between Borussia Dortmund and 1899 Hoffenheim at Signal Iduna Park on February 28, 2016 in Dortmund, Germany.  (Photo by Lars Baron/Bongarts/Getty Images)

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MANCHESTER, UNITED KINGDOM - SEPTEMBER 14 : Ilkay Gundogan (L) of Manchester City in action against Nico Elvediduring (R) of Borussia Monchengladbach during UEFA Champions League Group C match between Manchester City and Borussia Monchengladbach at The Etihad Stadium in Manchester, England on September 14, 2016. (Photo by Howard Walker/Anadolu Agency/Getty Images)

MANCHESTER, UNITED KINGDOM - SEPTEMBER 14 : Ilkay Gundogan (L) of Manchester City in action against Nico Elvediduring (R) of Borussia Monchengladbach during UEFA Champions League Group C match between Manchester City and  Borussia Monchengladbach at The Etihad Stadium in Manchester, England on September 14, 2016. (Photo by Howard Walker/Anadolu Agency/Getty Images)