Sonny Bill Williams has apologised for a provocative tweet labelling boxing judges "corrupt" after close friend Anthony Mundine's loss to Daniel Geale.
In pics: Geale beats Mundine in rematch
Three Australian judges gave Geale the victory by unanimous points decision, with Mundine claiming after the fight that he was "robbed" by the judges.
Williams agreed with Mundine, tweeting, "Hanging out with @Anthony_Mundine celebrating a victory. We don't pay attention to corrupt judges!!".
The Roosters-bound star included a picture of him with Mundine and Queensland Reds' flyhalf Quade Cooper.
Williams apologised on Twitter this morning, saying "Sorry about the tweet last night. Emotions were running high just very disappointed for my brother and that's how I saw the fight."
"No disrespect meant to Geale he's a great champion-fighter and it was a great night," Williams also tweeted.
Williams faces the toughest fight of his boxing career when he takes on South African veteran Francois Botha, who has fought Lennox Lewis and Mike Tyson during his career, on February 8.
Reds star Cooper is making his boxing debut on the undercard to Williams' fight.