DORTMUND, GERMANY - FEBRUARY 18:  Sergio Oliveira (R) of FC Porto competes for the ball against Sokratis Papastathopoulos (L) and Julian Weigl (C) of Borussia Dortmund 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 Lars Baron/Bongarts/Getty Images)