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LONDON, ENGLAND - SEPTEMBER 09: Eddie Hearn, Promoter speaks to the media during the Regis Prograis and Josh Taylor Press Conference in the lead up to the WBSS Super-Lightweight Ali Trophy Final at Park Plaza London Riverbank Hotel on September 09, 2019 in London, England. (Photo by Alex Burstow/Getty Images)

LONDON, ENGLAND - SEPTEMBER 09: Eddie Hearn, Promoter speaks to the media during the Regis Prograis and Josh Taylor Press Conference in the lead up to the WBSS Super-Lightweight Ali Trophy Final at Park Plaza London Riverbank Hotel on September 09, 2019 in London, England. (Photo by Alex Burstow/Getty Images)

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NEW YORK , United States - 1 June 2019; Andy Ruiz Jr celebrates after his IBF, WBA, WBO & IBO World Heavyweight Championship fight with Anthony Joshua at Madison Square Garden in New York, USA. (Photo By Stephen McCarthy/Sportsfile via Getty Images)

NEW YORK , United States - 1 June 2019; Andy Ruiz Jr celebrates after his IBF, WBA, WBO & IBO World Heavyweight Championship fight with Anthony Joshua at Madison Square Garden in New York, USA. (Photo By Stephen McCarthy/Sportsfile via Getty Images)

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Anthony Joshua (right) in action against Andy Ruiz Jr in the WBA, IBF, WBO and IBO Heavyweight World Championships title fight at Madison Square Garden, New York. (Photo by Nick Potts/PA Images via Getty Images)

Anthony Joshua (right) in action against Andy Ruiz Jr in the WBA, IBF, WBO and IBO Heavyweight World Championships title fight at Madison Square Garden, New York. (Photo by Nick Potts/PA Images via Getty Images)

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NEW YORK, NEW YORK - JUNE 01: Andy Ruiz Jr punches Anthony Joshua after their IBF/WBA/WBO heavyweight title fight at Madison Square Garden on June 01, 2019 in New York City. (Photo by Al Bello/Getty Images)

NEW YORK, NEW YORK - JUNE 01:  Andy Ruiz Jr  punches Anthony Joshua after their IBF/WBA/WBO heavyweight title fight at Madison Square Garden on June 01, 2019 in New York City. (Photo by Al Bello/Getty Images)

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CARDIFF, WALES - OCTOBER 28: Anthony Joshua (white trunks) and Carlos Takam (black trunks) in action during their IBF, WBA & IBO Heavyweight Championship contest at Principality Stadium on October 28, 2017 in Cardiff, Wales. (Photo by Richard Heathcote/Getty Images)

CARDIFF, WALES - OCTOBER 28:  Anthony Joshua (white trunks) and Carlos Takam (black trunks) in action during their IBF, WBA & IBO Heavyweight Championship contest at Principality Stadium on October 28, 2017 in Cardiff, Wales. (Photo by Richard Heathcote/Getty Images)