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BARCELONA, SPAIN - APRIL 21: Gerard Pique of Barcelona and David Luiz of PSG challenge for a header during the UEFA Champions League Quarter Final second leg match between FC Barcelona and Paris Saint-Germain at Camp Nou on April 21, 2015 in Barcelona, Spain. (Photo by David Ramos/Getty Images)

BARCELONA, SPAIN - APRIL 21:  Gerard Pique of Barcelona and David Luiz of PSG challenge for a header during the UEFA Champions League Quarter Final second leg match between FC Barcelona and Paris Saint-Germain at Camp Nou on April 21, 2015 in Barcelona, Spain.  (Photo by David Ramos/Getty Images)