Sonny Bill Williams will join the Sydney Roosters next season according to former Australian rugby league international Matty Johns. Johns today told Sydney\'s Triple M radio station that Williams would \"definitely\'\' swap being an All Black for life back in the NRL with the Roosters next season. \"From what I hear 100 per cent he\'ll be at the Roosters, there\'s only the details about his boxing career to sort out,\'\' Johns said. Williams has signed with the Chiefs for this Super Rugby season after agreeing to a one-year contract with the New Zealand Rugby Union but has been non-committal about his sporting future. Williams used to play league for Sydney club Canterbury Bulldogs before walking out of his contract to play union in France. He recently won the New Zealand Professional Boxing Association heavyweight title.