Mohammed Usman accepted a 30-month doping suspension after testing positive for testosterone prior to a UFC Rio bout with Valter Walker in October 2025, Combat Sports Anti-Doping (CSAD) announced Friday.
According to the anti-doping agency, which oversees the drug testing in the UFC, Usman admitted the use of testosterone before the Walker fight and in the past, as well as the use of banned peptide BPC-157 earlier that year. The sample was collected on Sept. 8, and the result came back days before UFC Rio, so Walker was left without an opponent.
“While Usman ultimately took responsibility for the above details,” CSAD stated in a release. “He did not do so in a timely fashion and not until CSAD confronted him with evidence…