BERLIN, GERMANY - MAY 29: Ilkay Guendogan of Borussia Dortmund jumps for a header during the DFB Cup Final 2015 training session at Olympiastadion on May 29, 2015 in Berlin, Germany. (Photo by Martin Rose/Bongarts/Getty Images)
BERLIN, GERMANY - MAY 29: Ilkay Guendogan of Borussia Dortmund jumps for a header during the DFB Cup Final 2015 training session at Olympiastadion on May 29, 2015 in Berlin, Germany. (Photo by Martin Rose/Bongarts/Getty Images)