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LIVERPOOL, ENGLAND - JUNE 03: referee Michael Oliverduring the friendly international football match between Brazil and Croatia at Anfield on June 3, 2018 in Liverpool, England. (Photo by Mark Leech/Offside/Getty Images)

LIVERPOOL, ENGLAND - JUNE 03: referee Michael Oliverduring the friendly international football match between Brazil and Croatia at Anfield on June 3, 2018 in Liverpool, England. (Photo by Mark Leech/Offside/Getty Images)

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Referee Michael Oliver gestures during the English Premier League football match between Liverpool and Chelsea at Anfield in Liverpool, north west England on May 11, 2016. / AFP / Paul ELLIS / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications. / (Photo credit should read PAUL ELLIS/AFP/Getty Images)

Referee Michael Oliver gestures during the English Premier League football match between Liverpool and Chelsea at Anfield in Liverpool, north west England on May 11, 2016. / AFP / Paul ELLIS / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications.  /         (Photo credit should read PAUL ELLIS/AFP/Getty Images)

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Referee Michael Oliver officiates during the English Premier League football match between Liverpool and Stoke City at Anfield in Liverpool, north west England on December 27, 2016. / AFP / Paul ELLIS / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications. / (Photo credit should read PAUL ELLIS/AFP/Getty Images)

Referee Michael Oliver officiates during the English Premier League football match between Liverpool and Stoke City at Anfield in Liverpool, north west England on December 27, 2016. / AFP / Paul ELLIS / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications.  /         (Photo credit should read PAUL ELLIS/AFP/Getty Images)