Few days after returning from a six-month suspension, Sean O’Malley has been once more placed under serious suspicion by USADA for substance related offence.

The American mixed martial artist was coming off of a six-month ban after he was tested positive to Ostarine.

He has been scheduled to take part in the Octagon at UFC 239 but it is not likely he will return to the event as planned originally.

However, it is just two weeks to the his challenge against Marlon Vera, but O’Malley will be out as he has been flagged to have some Ostarine in his body. He has been ruled out of the fight at UFC 239.

“I want to share the facts with you about my latest USADA tests and how it affects my fight next month,” Sean O’Malley wrote on Instagram. “USADA has notified me that Ostarine, the substance that showed up in my system last year and led to USADA sanctioning me, has resurfaced at an extremely low level in two recent tests.  The good news is that USADA says this is most likely residual from last year and that low level is providing me with no performance advantage. That’s why USADA is not re-sanctioning me for these test results. I already served a USADA sanction for the presence of Ostarine in my system, and it has decreased dramatically since last year.

“The bad news is that the Nevada State Athletic Commission has temporarily suspended me while they look into the situation. While I feel terrible to let down my fans who were looking forward to watching me fight in Las Vegas next month, I look forward to publicly discussing my case before the Nevada State Athletic Commission with scientific experts who can explain why very low levels of Ostarine are showing up in my system. I want to make one thing very clear — I have never purposely taken any prohibited substances to gain an advantage,” Sean O’Malley continued. “I will subject myself to whatever additional testing is required of me by the Nevada State Athletic Commission. I want to get this situation finally cleared up so  I can return to the Octagon as soon as I can.

O’Malley has a good record on which he looks to improve, an 11-0 record as a professional, 3 of which are inside the Octagon. It is more than a year now that the 24-year-old hasn’t fought. Meanwhile, NSAC is yet to fix a date for the hearing of the allegation of substance abuse raised against the fighter by the USADA.