Anthony Mundine and Sonny Bill Williams are facing possible legal action over comments they made on social media after Mundine's defeat to Daniel Geale.
In pics: Geale beats Mundine in rematch
The New South Wales Combat Sports Authority is speaking to lawyers about whether it can sue the pair over several claims made, including one that the judges of Wednesday night's IBF middleweight title were “corrupt”, The Australian reports.
"I'm still seeking advice as to what action, if any, we can take legally against Mundine, a registered fighter in the state of NSW," the authority's chairman Denis Fitzgerald said.
"I don't know yet where we stand legally with (Sonny Bill) Williams as he is currently not registered or licensed to fight in NSW.
"I have called in litigation lawyers to table a report to a full board meeting.
"Mundine's, Williams's and other outbursts on social media were disrespectful to properly accredited and experienced panel of judges."
Williams caused an uproar after tweeting a photo of himself, Mundine and Wallabies five-eighth Quade Cooper after the fight.
The former All Black, who is set to join NRL club Sydney Roosters on February 18 and will fight South African Francois Botha in Brisbane next Friday, has since apologised for the tweet.
When the three judges scores, which awarded a unanimous victory to Geale, came in after the fight, Mundine stormed out of the ring.
He later claimed he had been robbed and the decision was an "ambush".