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MANCHESTER, ENGLAND - AUGUST 12: David de Gea of Manchester United looks on during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England. (Photo by Matthew Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - AUGUST 12:  David de Gea of Manchester United looks on during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England.  (Photo by Matthew Peters/Manchester United via Getty Images)

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MANCHESTER, ENGLAND - AUGUST 12: Paul Pogba and Marcus Rashford (R) of Manchester United share a joke during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England. (Photo by Matthew Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - AUGUST 12:  Paul Pogba and Marcus Rashford (R) of Manchester United share a joke during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England.  (Photo by Matthew Peters/Manchester United via Getty Images)

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MANCHESTER, ENGLAND - AUGUST 12: Paul Pogba of Manchester United in action during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England. (Photo by Matthew Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - AUGUST 12:  Paul Pogba of Manchester United in action during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England.  (Photo by Matthew Peters/Manchester United via Getty Images)

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MANCHESTER, ENGLAND - AUGUST 12: Paul Pogba of Manchester United in action during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England. (Photo by Matthew Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - AUGUST 12:  Paul Pogba of Manchester United in action during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England.  (Photo by Matthew Peters/Manchester United via Getty Images)

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MANCHESTER, ENGLAND - AUGUST 12: (L-R) David de Gea, Juan Mata, Marcos Rojo and Ander Herrera of Manchester United share a joke during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England. (Photo by John Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - AUGUST 12:  (L-R) David de Gea, Juan Mata, Marcos Rojo and Ander Herrera of Manchester United share a joke during a first team training session at Aon Training Complex on August 12, 2016 in Manchester, England.  (Photo by John Peters/Manchester United via Getty Images)