DORTMUND, GERMANY - APRIL 12: Kylian Mbappe of Monaco and Lukasz Piszczek of Dortmund battle for the ball during to the UEFA Champions League Quarter Final: First Leg match between Borussia Dortmund and AS Monaco at Signal Iduna Park on April 12, 2017 in Dortmund, Germany. (Photo by TF-Images/Getty Images)