Sonny Bill to put on boxing gloves

Sonny Bill Williams's boxing debut in Brisbane next month has been confirmed.

The former Bulldogs superstar is to fight four rounds on the undercard to Anthony Mundine's middleweight world title bout against Daniel "The Real Deal" Geale.

Mundine announced details of Williams's bout on rugby league's The Footy Show last night.

Williams, who walked out on the Dogs last year to play rugby union in France, has been training for the fight in a Toulon boxing gym.

The May 27 bout is just 11 days before his return to Sydney to play for the Barbarians against the Wallabies at the SFS on June 6.