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KASSEL, GERMANY - AUGUST 31: Jannik Haberer during the German U21 public training session at Auestadion on August 31, 2016 in Kassel, Germany. The German U21 team will compete against Slovakia in two days and it is the first game after winning the silver medal at the 2016 Rio Olympics. (Photo by Alexander Koerner/Bongarts/Getty Images)

KASSEL, GERMANY - AUGUST 31: Jannik Haberer during the German U21 public training session at Auestadion on August 31, 2016 in Kassel, Germany. The German U21 team will compete against Slovakia in two days and it is the first game after winning the silver medal at the 2016 Rio Olympics.  (Photo by Alexander Koerner/Bongarts/Getty Images)