BROCK Lesnar also failed a drug test on the day of his UFC 200 fight against Mark Hunt, having already tested positive in the lead-up, the UFC revealed today.

WWE superstar Lesnar, 39, beat Hunt via unanimous decision in Las Vegas on July 9 (US time) but the ‘Super Samoan’ has since branded him a “f***ing cheat” and demanded to be given his record $2.5 million purse in the wake of the positive tests.

The UFC said in a statement it had been notified by USADA that Lesnar on fight day tested positive to the same substance he was flagged for in a June 28 test - a substance that is yet to be officially revealed. The UFC and USADA will reportedly not name the drug unless Lesnar first does so himself.

LA Times MMA reporter Lance Pugmire and ESPN’s Brett Okamoto said the substance was an estrogen blocker - one of the same substances that knocked Jon Jones out of the planned main event v Daniel Cormier. Estrogen blockers are known to be used in conjunction with steroids, though neither Lesnar or Jones have tested positive for steroids, according to any official information or reports.

I'm told by an official with knowledge of Brock Lesnar's positive test that the substance is clomiphene, the same one found in @JonnyBones. — Lance Pugmire (@latimespugmire) July 19, 2016

According to sources, Brock Lesnar tested positive for Clomiphene, the same anti-estrogen blocker Jon Jones tested positive for. — Brett Okamoto (@bokamotoESPN) July 19, 2016

Lesnar’s latest possible violation was categorised as in-competition, occurring within 12 hours before or after the fight.

The result will cement Lesnar’s risk of a two-year ban from the UFC. The UFC’s anti-doping policy states that two positive tests could be adjudged aggravating circumstances and lead to additional sanctions.

Lesnar is facing sanctions from both USADA and the Nevada State Athletic Commission, which could also strip part of his purse.

Brock Lesnar punches Mark Hunt (R) during UFC 200. Source: AFP

The UFC statement read, in full: “The UFC organisation was notified today that the U.S. Anti-Doping Agency (USADA) has informed Brock Lesnar that his in-competition sample collection from July 9, 2016, at UFC 200, has tested positive for the same substance as his previously announced out-of-competition collection on June 28, 2016.

“USADA, the independent administrator of the UFC Anti-Doping Policy, will handle the results management and appropriate adjudication of this case. It is important to note that, under the UFC 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.

“Consistent with all previous potential anti-doping violations, additional information will be provided at the appropriate time as the process moves forward.”

Lesnar’s only response so far has been a statement to AP: “We will get to the bottom of this.”

The wrestler controversially had a mandatory four-month testing period waived before making his UFC return, for his first fight in the Octagon since 2011.

However, he was tested eight times by USADA in the month leading up to UFC 200 - and has now been outed as having failed at least two of those doping controls.

Hunt was voicing his rage again on Twitter today.

One response to leading MMA journalist Ariel Helwani read: “U and I know it ain’t no asthma bulls**t typical coming from the assholes training camp f***en bunch of cheating scum.”

@JonathanNg19 @BrockLesnar why rematch a dirty cheat what's the point he has to cheat to compete — mark richard hunt (@markhunt1974) July 19, 2016

Hunt (12-11-1) savaged Lesnar (6-3-0) and the UFC after the wrestler initial positive test.

“I said (to the UFC), ‘If you don’t give me half his s**t [purse], I’m walking away from this company, I want out of here. This is rubbish’,” Hunt said.

“You [UFC] better do something. I already talked to the bosses. They better do something or I want out of here, I want a release from my contract. You guys are just making a mockery out of us, you’re making a fool out of me, you make me look like an idiot.

“I lost on that night to some f***ing cheat. There’s no way he could weigh 265 [pounds] like me - he was about 500 kilos, there was no f***ing way he was weighing in at my weight. It just makes a mockery of the whole sport, it makes a fool out of all of us, all the people who’ve paid money for top end fighting - now all they’ve got is a cheat against a guy who doesn’t cheat.

Mark Hunt punches Brock Lesnar (L) during UFC 200. Source: AFP

“It’s ridiculous, I think it’s rubbish and I think it’s time for the UFC to stand up. Otherwise I don’t want to be a part of this company and I think there’s a lot of fighters that understand.

“They give frickin’ [Nick] Diaz five years for marijuana - what about these clowns that are cheating? F***ing clowns that are caught doping for enhancement.”

Lesnar’s positive tests validated Hunt’s explosive claim that the WWE megastar would be “juiced up to the gills” for ths fight, and also his weekend declaration that Lesnar’s B sample was sure to also be positive.

Hunt, who was in the first bout of a new six-fight contract with the UFC at UFC 200, was paid $700,000 to fight Lesnar. He was not able to trouble Lesnar with his ferocious punching power during the bout, largely due to the wrestler’s incredible size and athleticism.

It is not expected that Lesnar’s WWE career will be affected. The promotion could briefly sit him out under its Wellness Program, though he is set to wrestle Randy Orton at Summer Slam in August. He is also eligible to be taken in Wednesday’s WWE Draft, the roster split between Raw ans SmackDown.