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MANCHESTER, ENGLAND - SEPTEMBER 10: Paul Pogba of Manchester United in action during the Premier League match between Manchester United and Manchester City at Old Trafford on September 10, 2016 in Manchester, England. (Photo by Clive Brunskill/Getty Images)

MANCHESTER, ENGLAND - SEPTEMBER 10: Paul Pogba of Manchester United in action during the Premier League match between Manchester United and Manchester City at Old Trafford on September 10, 2016 in Manchester, England.  (Photo by Clive Brunskill/Getty Images)

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A minute of silence is observed by the fans of bitter rivals Manchester City and Manchester United at the Old Trafford stadium to commemorate the 50th anniversary of the Munich air crash on February 10th 2008 in Manchester (Photo by Tom Jenkins/Getty Images). An image from the book "In The Moment" published June 2012

A minute of silence is observed by the fans of bitter rivals Manchester City and Manchester United at the Old Trafford stadium to commemorate the 50th anniversary of the Munich air crash on February 10th 2008 in Manchester (Photo by Tom Jenkins/Getty Images). An image from the book "In The Moment" published June 2012

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MANCHESTER, ENGLAND - SEPTEMBER 10: Kevin De Bruyne of Manchester City moves forward during the Premier League match between Manchester United and Manchester City at Old Trafford on September 10, 2016 in Manchester, England. (Photo by Clive Brunskill/Getty Images)

MANCHESTER, ENGLAND - SEPTEMBER 10:  Kevin De Bruyne of  Manchester City moves forward during the Premier League match between Manchester United and Manchester City at Old Trafford on September 10, 2016 in Manchester, England.  (Photo by Clive Brunskill/Getty Images)

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MANCHESTER, ENGLAND - NOVEMBER 11: Juan Mata of Manchester United argues with Raheem Sterling of Manchester City after the Premier League match between Manchester City and Manchester United at Etihad Stadium on November 11, 2018 in Manchester, United Kingdom. (Photo by Laurence Griffiths/Getty Images)

MANCHESTER, ENGLAND - NOVEMBER 11:  Juan Mata of Manchester United argues with Raheem Sterling of Manchester City after the Premier League match between Manchester City and Manchester United at Etihad Stadium on November 11, 2018 in Manchester, United Kingdom.  (Photo by Laurence Griffiths/Getty Images)