"We have made Sonny and Khoder [Williams' agent Khoder Nasser] an offer," says NZRU chief executive Steve Tew. "We have been talking to them and the dialogue has been positive but we don't have any ink on paper. We would obviously love Sonny to come back and play rugby here and we have made that clear. It is up to Sonny and Khoder now."
The NZRU are wary of getting ahead of themselves but in their experience, despite the perception of Williams' management team being prone to playing parties off against each other, Nasser is not one to waste time or mislead.
The wider team that looks after Williams have had a clear ambition since he infamously walked out of the Bulldogs in 2008 - they want him to be recognised as the world's greatest cross-code athlete and to be heavyweight boxing champion of the world.
He has collected an impressive number of trinkets to date: he won an NRL grand final with the Bulldogs in 2004, played in the Amlin Challenge Cup final with Toulon, won Super Rugby with the Chiefs and the World Cup with the All Blacks, and is the reigning New Zealand heavyweight boxing champion.
The Roosters are a reasonable prospect to win the NRL this year and Williams would do much to strengthen a Chiefs side that has won consecutive titles and an All Black side that will be well equipped to make a strong defence in 2015. If he could help the Kiwis win the World Cup later this year and make it to the Olympics in 2016 (where New Zealand are fancied to win the sevens gold medal), he would have an impressive claim to be the world's best cross-code athlete. However, there are thought to be other factors driving Williams back to Hamilton and rugby. He found a level of contentment and belonging with the Chiefs that he hadn't felt since his early days with the Bulldogs. He made a strong friendship with Liam Messam, had great respect for the coaching team and felt settled and relaxed in the city.
As a sign of where his heart lies, he attended the last Chiefs round-robin game against the Blues at Eden Park and celebrated with his former team-mates. He's believed to have mentioned then that he was hankering for a return - that the media scrutiny and public attention he was under in Sydney had become a bore and restrictive to his everyday life.
Williams maintained when he left the Chiefs last year that he would be back - that his decision to join the Sydney Roosters was made five years previously on a handshake deal that he felt he had to honour. But despite his assurances, it always felt more of an 'if' he would return to rugby rather than a 'when'.
Now everyone in New Zealand rugby is planning on Williams being here in 2014.