Anthony Mundine and Sonny Bill Williams may face legal action over their criticism of the judges after Mundine's fight with Daniel Geale on Wednesday night.

Geale won a unanimous points decision to retain his IBF middleweight belt at the Sydney Entertainment Centre.

Before the decision was handed down, Mundine was heard during Main Event's coverage to say: "They rob me. They're taking their time. If I don't get this fight you know what's up. You all know what happened."

The 37-year-old later re-iterated his claim that he was robbed of victory.

"I walked into an ambush tonight, it’s as simple as that," he said.

"I thought it was going to be bad but I didn't think it was going to be that bad.

"I told you before. The only way that they going to win is if they rob me. That's exactly what happened."

Williams echoed Mundine's sentiments, tweeting a photo with the caption: "Hanging out with @Anthony-Mundine celebrating a victory. We don't pay attention to corrupt judges!"

Williams later apologised for his comments.

The son of judge Ray Reed confirmed on a Sydney radio station that his father was considering his legal options.

NSW Combat Sports Authority chairman Denis Fitzgerald is also seeking legal advice to determine whether the authority has grounds to sue over the remarks.

"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," Fitzgerald told News Ltd.

"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."

Judge Reed scored the fight 117-111 in Geale's favour, as did judge Tony Marretta, while judge Charlie Lucas scored it 116-112 to Geale.

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