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

Netherlands v Argentina: Semi Final - 2014 FIFA World Cup Brazil

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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.

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