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Georginio Wijnaldum of the Netherlands and Javier Mascherano of Argentina clash during the 2014 FIFA World Cup Brazil Semi Final match between Netherlands and Argentina at Arena de Sao Paulo on July 9, 2014 in Sao Paulo, Brazil. (Photo by Mike Hewitt - FIFA/FIFA via Getty Images)

Argentina's Javier Mascherano topples over after head-to-head collision

Argentina's Javier Mascherano went up for a header, during the play his head crashed into Georginio Wijnaldum of the Netherlands. Mascherano went down and was clearly disoriented. Debate has been sparked on his quick return to the game following such a serious head collision.