Mohammed Usman has accepted a 30-month doping suspension after testing positive for testosterone. The violation occurred prior to a scheduled UFC Rio bout against Valter Walker in October 2025, as announced by Combat Sports Anti-Doping (CSAD) on Friday.
CSAD, the anti-doping agency overseeing UFC drug testing, reported that Usman admitted to using testosterone before the Walker fight and on previous occasions. He also acknowledged using the banned peptide BPC-157 earlier in the same year. The sample was collected on September 8, and the test results were returned days before UFC Rio, leading to Walker being left without an opponent.
CSAD stated that while Usman eventually took responsibility for his actions, he did not do so in a timely manner. His admission occurred only after CSAD presented him with independent evidence gathered during an investigation into his use of multiple prohibited substances and his attempt to provide a false explanation.
The agency noted that "aggravating circumstances" are determined to exist when a UFC athlete uses multiple substances and engages in deceptive or obstructive conduct to avoid adjudication of an Anti-Doping Policy Violation. Consequently, CSAD decided to add an additional six months to the standard two-year suspension due to these aggravating factors.