Thursday afternoon, it was announced that George Sullivan had been pulled from his ‘UFC on FOX 20’ scrap against Hector Urbina due to a “potential compliance issue” with USADA.

The UFC released a statement on the situation, revealing that Sullivan was pulled after voluntarily disclosing the list of supplements he took, one of which apparently raised a red flag with USADA.

Sullivan took to Facebook to explain his case:

“As anyone that knows me or follows me on social media is aware, I am an outspoken advocate for keeping MMA clean of PEDs. I was shocked when I was told that I could not fight this weekend. I did not fail a test. I was pulled from the card due to a natural supplement being on my list of supplements that I voluntarily disclosed to USADA. This supplement has been on my list that I have disclosed to both the UFC and USADA prior to my previous fights. I have been tested for PEDs countless times in my career by different testing authorities, including USADA. I have never tested positive for any banned substances. I want to thank everyone that supports me. I plan to do whatever it takes to clear my name. I am confident that my name will be cleared.”