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LONDON, ENGLAND - NOVEMBER 13: Jose Mourinho, manager of Manchester United poses for a photograph duringk a break in the men's single match between Novak Djokovic of Serbia and Dominic Thiem of Austria on day one of the ATP World Tour Finals at O2 Arena on November 13, 2016 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - NOVEMBER 13:  Jose Mourinho, manager of Manchester United poses for a photograph duringk a break in the men's single match between Novak Djokovic of Serbia and Dominic Thiem of Austria on day one of the ATP World Tour Finals at O2 Arena on November 13, 2016 in London, England.  (Photo by Clive Brunskill/Getty Images)