The US Anti-Doping Agency has informed veteran UFC heavyweight Frank Mir of a potential policy violation, stemming from his fight on March 20th in Brisbane, Australia, the promotion announced on Friday.

No sanctions will be imposed on Mir until the conclusion of the legal process he is afforded in this situation.

The 36-year-old suffered a first round knockout at the hands of Mark Hunt in the main event of the UFC Brisbane card.  It was his second consecutive defeat following a September unanimous decision defeat to Andrei Arlovski.

Folowing the announcement of the potential violation, Mir released a statement through his Twitter account.

"To all my fans and supporters, I recently have been notified by usada that the test I took on the night of the fight came back positive for a substance I did not take.  I don't know how this is possible as I did not take any performance enhancing drugs (PEDs) to compete.  I have never tested positive for a banned substance since joining the UFC and becoming a 2x champion.  I ask all of you to hold judgement against me until all the facts have been revealed. Thank you, Frank Mir."

Mir holds an 18-11 overall MMA record.