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Central defender/ Centre-half
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Starting out on the edge of his/her team’s penalty area, the central defender’s role is to protect the goalkeeper and, by implication, the goal. 
There are typically two central defenders in a team, but some formations utilise three
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Notable central defenders:
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Bobby Moore(England)
Fabio Cannavaro(Italy)
Fernando Hierro (Real Madrid)
Jaap Stam (Manchester United)
Roberto Carlos (Real Madrid)
Ricardo Carvalho (Porto)
John Terry (Chelsea)
Carles Puyol (Barcelona)
Paolo Maldini (AC Milan)
John Terry (Chelsea)
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Sweeper (Libero)
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The sweeper or libero (meaning ‘free’) is an exceptional position which is seen irregularly today. The role of the sweeper is basically to
act as an all-purpose defender who responds to any breach of the defensive line.
As the last line of defence, he also initiates counter-attacks by bringing the ball out of the penalty area, thus necessitating some of the skills of the midfielder like passing, close control and dribbling.
Special mention must be made of Franz Beckenbauer. ‘Der Kaiser’ was captain of the World Cup winning West German side in 1974 and is today widely credited as the inventor of the sweeper position.
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Notable sweepers:
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Franz Beckenbauer (Germany)
Franco Baresi (Italy)
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Fullback/ Wingback
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Although basically holding the same starting position, on the left and right of each central defenders respectively, the difference between
the fullback and the wingback is the latter’s willingness to move forward and support attacks.
This is achieved either by running with the ball or ‘overlapping’ the winger (running ahead) to add width to an attack. However, both positions necessitate strong defensive skills and the coaches Fabio Capello and Jose Mourinho have been proponents in the modern era of strictly defensive full-backs.
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Notable fullbacks/wingbacks:
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Cafu (Brazil)
Roberto Carlos (Brazil)
Javier Zanetti (Argentina)
Gianluca Zambrotta (Italy)
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