Sweating profusely after a vigorous sparring session with confidante Anthony Mundine ahead of the third bout of his professional boxing career on Saturday night, Williams said he could still possibly feature in the Crusaders' opening match against the Blues on February 19.
"Hopefully, hopefully," he said when asked of his prospects of being available.
"I'm feeling positive, we'll reassess it after this weekend."
Williams refocuses on rugby on Sunday when he returns to Christchurch, ideally undamaged after his fight with unemployed Sydney forklift driver Scott Lewis on the Gold Coast.
Williams certainly showed no ill-effects of the minor fracture to his shin bone at Mundine's gym in down-at-heel Redfern today - the heavyweight was put through his paces before launching a spirited defence of his determination to juggle rugby commitments with boxing.
"Obviously there'll be my knockers," he said, reiterating his belief the core skills of boxing have aided his development as a footballer.
"For me, the proof's in the pudding. In the last two years I've gone from being a relatively unknown rugby player to playing for the All Blacks. I put that hugely down to the fact I've been doing boxing on the side, I feel it gives me an edge," he said.
And the critics who say he may be tempting fate?
"I'm respectful to others but I do what's best for myself and my family, just like any person in the world."
Williams said provision to box professionally would be included in any future contracts once he left French rugby club Toulon - like the one he signed with the New Zealand Rugby Union ahead of his test debut on last November's grand slam tour of the UK and Ireland.
Williams confirmed there was the possibility of another fight before the World Cup in September, if he felt it would be beneficial.
"Rugby is the main goal .... trying to be the best rugby player I can be and playing in that World Cup squad and If I feel having a fight could help sharpen me up coming in towards the World Cup I'll do that."
Williams has been unable to run since the injury flared during the All Blacks grand slam-clinching defeat of Wales but says he has maintained his fitness by pool and bike work.
The NZRU medical staff, he said, endorsed what should prove the toughest test of his fledging career.
"When I had the scan I said 'Should I brush the boxing?'. A couple of weeks later I could bounce around the ring.
"I've listened to the guidelines from the New Zealand Rugby Union, I wouldn't be here otherwise."
Meanwhile, his latest opponent may finally provide a viable challenge - unlike the two ex-pat New Zealanders that proved embarrassingly inept last year.
Gary "The Baboon" Gurr and Ryan "Hulk" Hogan barely laid a hand on Williams in their debuts before succumbing to technical knock outs - and haven't fought since.
Lewis at least has a 3-win, 4-loss record - although his most notable opponent was rugby league player Carl Webb, who he beat inside three rounds in January last year.
The 36-year-old, who served three months in Sydney's notorious Long Bay jail after committing a robbery in 1997, turned up at Mundine's gym while Williams was holding court and thankfully bore little resemblance to the beer-gutted 135kg Hogan.
"My aim's to win. My preparation's been pretty tough. I've been chucking up in the (hot) weather doing my runs."
Williams was impressed with Lewis's punching power as he watched his rival spar.
"You can see Scotty's taken this pretty seriously," he said.
"This isn't a joke. He's a more than willing opponent.
"I've probably fought two exhibition fights, now I'm stepping up in class."
