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MANCHESTER, ENGLAND - APRIL 19: Ander Herrera, Marcos Rojo, Eric Bailly and Marouane Fellaini of Manchester United in action during a first team training session at Aon Training Complex on April 19, 2017 in Manchester, United Kingdom. (Photo by John Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - APRIL 19:  Ander Herrera, Marcos Rojo, Eric Bailly and Marouane Fellaini of Manchester United in action during a first team training session at Aon Training Complex on April 19, 2017 in Manchester, United Kingdom.  (Photo by John Peters/Manchester United via Getty Images)

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MANCHESTER, ENGLAND - DECEMBER 11: Antonio Valencia, Ander Herrera, Eric Bailly, Romelu Lukaku and Marcos Rojo of Manchester United in action during a first team training session ahead of the UEFA Champions League Group H match between Valencia and Manchester United at Aon Training Complex on December 11, 2018 in Manchester, United Kingdom. (Photo by Matthew Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - DECEMBER 11:  Antonio Valencia, Ander Herrera, Eric Bailly, Romelu Lukaku and Marcos Rojo of Manchester United in action during a first team training session ahead of the UEFA Champions League Group H match between Valencia and Manchester United at Aon Training Complex on December 11, 2018 in Manchester, United Kingdom.  (Photo by Matthew Peters/Manchester United via Getty Images)

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MANCHESTER, ENGLAND - MARCH 03: (EXCLUSIVE COVERAGE) Anthony Martial of Manchester United in action during a first team training session at Aon Training Complex on March 3, 2017 in Manchester, England. (Photo by John Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - MARCH 03:  (EXCLUSIVE COVERAGE) Anthony Martial of Manchester United in action during a first team training session at Aon Training Complex on March 3, 2017 in Manchester, England.  (Photo by John Peters/Manchester United via Getty Images)

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LONDON, ENGLAND - AUGUST 07: (EXCLUSIVE COVERAGE) Eric Bailly, Ander Herrera, Marouane Fellaini and Antonio Valencia of Manchester United pose with the Community Shield trophy in the dressing room after the FA Community Shield match between Leicester City and Manchester United at Wembley Stadium on August 7, 2016 in London, England. (Photo by John Peters/Manchester United via Getty Images)

LONDON, ENGLAND - AUGUST 07:  (EXCLUSIVE COVERAGE) Eric Bailly, Ander Herrera, Marouane Fellaini and Antonio Valencia of Manchester United pose with the Community Shield trophy in the dressing room after the FA Community Shield match between Leicester City and Manchester United at Wembley Stadium on August 7, 2016 in London, England.  (Photo by John Peters/Manchester United via Getty Images)

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MANCHESTER, ENGLAND - JANUARY 28: (EXCLUSIVE COVERAGE) Ander Herrera, Antonio Valencia and Marcos Rojo of Manchester United in action during a first team training session at Aon Training Complex on January 28, 2018 in Manchester, England. (Photo by John Peters/Manchester United via Getty Images)

MANCHESTER, ENGLAND - JANUARY 28:  (EXCLUSIVE COVERAGE) Ander Herrera, Antonio Valencia and Marcos Rojo of Manchester United in action during a first team training session at Aon Training Complex on January 28, 2018 in Manchester, England.  (Photo by John Peters/Manchester United via Getty Images)