The United States Anti-Doping Agency (USADA) informed Ultimate Fighting Championship on Tuesday that former heavyweight champion Brock Lesnar had tested positive for a banned substance, based on a sample collected on July 9, the night he beat Mark Hunt at UFC 200. The result of the test showed the presence of the same substance found in another out-of-competition sample taken from Lesnar on June 28.

The substance has not been identified officially but, according to ESPN, which cited a source, it is clomiphene, an estrogen blocker that Jon Jones had also tested positive for, leading to his removal from the UFC 200 main event. Estrogen-blockers can mask the side-effects of some performance enhancing drugs.

Responding to the notification from USADA, UFC said that under its own anti-doping policy, “there is a full fair legal review process that is afforded to all athletes before any sanctions are imposed. The Nevada State Athletic Commission also retains jurisdiction over this matter as the sample collection was performed at UFC 200 in Las Vegas.”

Lesnar, 39, who did not comment on the matter, made at least $2.5 million at UFC 200 in guaranteed purse alone, and possibly several millions more in bonuses. He could fight Hunt on July 9 despite the previous failed test because results of the June 28 sample came in only on July 15.

Also on Tuesday, even with the controversy surrounding him, Lesnar was the eighth to be picked in 2016 WWE Draft. He will appear exclusively on “Monday Night Raw.”

The anti-doping agency has collected eight samples from Lesnar so far this year, first six of which were clean.