McGregor’s claims aren’t the first instance of Kamaru Usman being accused of using Performance-Enhancing Drugs. Former interim champion Colby Covington has often tried to insinuate that “The Nigerian Nightmare” might have breached USADA’s anti-doping policy in the past.

In an interview with The Schmo, Covington insinuated Usman might be consuming EPO (erythropoietin). Colby’s claims rise from the champion’s decision to refuse to headline UFC 244.

Furthermore, Covington claimed that Kamaru Usman has been violating the anti-doping policy since the advent of the Nigerian-born’s athletic career:

Covington has been unrelenting in accusing Kamaru Usman of cheating. The number one ranked welterweight recently called Usman a “juicehead” in an interview with Submission radio.

When Colby Covington accused USADA of hiding Kamaru Usman’s test results

The United States Anti-Doping Agency partnered with the UFC in 2015. Under their testing program, USADA conducts an average of five tests per fighter per year. The agency regulates drug tests scrupulously, having flagged several renowned UFC stars in the past.

However, Colby Covington believes the agency has withheld Kamaru Usman’s test results. During the UFC 245 media scrum, Covington blamed the UFC for protecting the champion:

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