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Referee Manuel Graefe shows Dortmund's French striker Ousmane Dembele the yellow card during the German Cup DFB Pokal semifinal football match between FC Bayern Munich and BVB Borussia Dortmund in Munich, on April 26, 2017. / AFP PHOTO / GUENTER SCHIFFMANN / RESTRICTIONS: ACCORDING TO DFB RULES IMAGE SEQUENCES TO SIMULATE VIDEO IS NOT ALLOWED DURING MATCH TIME. MOBILE (MMS) USE IS NOT ALLOWED DURING AND FOR FURTHER TWO HOURS AFTER THE MATCH. == RESTRICTED TO EDITORIAL USE == FOR MORE INFORMATION CONTACT DFB DIRECTLY AT +49 69 67880 / (Photo credit should read GUENTER SCHIFFMANN/AFP/Getty Images)

Referee Manuel Graefe shows Dortmund's French striker Ousmane Dembele the yellow card during the German Cup DFB Pokal semifinal football match between FC Bayern Munich and BVB Borussia Dortmund in Munich, on April 26, 2017. / AFP PHOTO / GUENTER SCHIFFMANN / RESTRICTIONS: ACCORDING TO DFB RULES IMAGE SEQUENCES TO SIMULATE VIDEO IS NOT ALLOWED DURING MATCH TIME. MOBILE (MMS) USE IS NOT ALLOWED DURING AND FOR FURTHER TWO HOURS AFTER THE MATCH. == RESTRICTED TO EDITORIAL USE == FOR MORE INFORMATION CONTACT DFB DIRECTLY AT +49 69 67880

 /         (Photo credit should read GUENTER SCHIFFMANN/AFP/Getty Images)