DORTMUND, GERMANY - FEBRUARY 18: Iker Casillas (C) of FC Porto appeals offside to an assistant refere while Lukasz Piszczek (R) of Borussia Dortmund heads the ball to score his team's first goal during the UEFA Europa League round of 32 first leg match between Borussia Dortmund and FC Porto at Signal Iduna Park on February 18, 2016 in Dortmund, Germany. (Photo by Dennis Grombkowski/Bongarts/Getty Images)
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Bongarts Dennis Grombkowski