Gary Cahill
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Gary James Cahill is an English former professional footballer who played as a centre-back.
Cahill training with England at the 2018 FIFA World Cup
Cahill warming up for Bolton Wanderers in 2011
Cahill playing for Chelsea in 2012
Cahill playing for Chelsea in 2014
Defender (association football)
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In the sport of association football, a defender is an outfield player whose primary role is to stop attacks during the game and prevent the opposition from scoring.
England women's captain Leah Williamson (left) defends for Arsenal.
Centre-back John Terry (right) closely marks centre-forward Didier Drogba.
Edwin van der Sar, pictured playing for Manchester United during the 2010–11 season, is considered to be one of the pioneers of the sweeper-keeper role.
Paolo Maldini marking a player during a friendly match.