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LONDON, ENGLAND - MAY 21: Chris Smalling of Manchester United (12) is sent off by referee Mark Clattenburg after a second booking during The Emirates FA Cup Final match between Manchester United and Crystal Palace at Wembley Stadium on May 21, 2016 in London, England. (Photo by Paul Gilham/Getty Images)

LONDON, ENGLAND - MAY 21:  Chris Smalling of Manchester United (12) is sent off by referee Mark Clattenburg after a second booking during The Emirates FA Cup Final match between Manchester United and Crystal Palace at Wembley Stadium on May 21, 2016 in London, England.  (Photo by Paul Gilham/Getty Images)