FC Barcelona's midfielder Sergio Busquets, background, attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's defender Carles Puyol attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's defender Maxwell attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's midfielder Ibrahim Afellay attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's goalkeeper Victor Valdes attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's midfielder Xavi Hernández attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's defender Daniel Alves attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's defenders Gerard Piqué, left, and Andreu Fontàs attend the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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From left: FC Barcelona's Jonathan dos Santos Ramírez, David Villa and Maxwell attend the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's coaching staff watches players in action during the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's defenders Carles Puyol, foreground, and Gerard Piqué attend the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's defender Éric Abidal attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's midfielder Xavi Hernández attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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Center, from left: FC Barcelona's José Manuel Pinto and Javier Mascherano attend the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's midfielder Andrés Iniesta and coach Paco Seirullo at the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's midfielder Andrés Iniesta attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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FC Barcelona's goalkeeper Victor Valdes attends the team's training session at the Wembley Stadium ahead of the 2010-11 UEFA Champions League match against Manchester United.

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