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Andy Ruiz JR would be banned from fighting for the WBC world title if he competes in next years Olympics.
The Mexican, who beat Anthony Joshua in June, holds the WBA, WBO and IBF belts.
Ruiz will face Joshua again in their rematch in Saudi Arabia in December.
But Ruiz has also expressed a desire to compete at Tokyo 2020.
In doing so, however, he would be denying himself the chance to add the fourth belt to his collection.
WBC president Mauricio Sulaiman said: “The WBC strongly disagrees with supporting a professional boxer competing in the Olympic games. It’s something unacceptable that should not be accepted by fans and boxing experts in the world.
“Olympic amateur boxing is completely different. They are two different sports and it is very dangerous. We cannot accept this. If any professional boxer, including champions or former champions, decide to participate in the next Olympics, they will have a sanction of at least two years in the WBC.”