Sonny Bill Williams in the black trunks, Paul Gallen in the blue.

It’s the high-profile bout we’ve been expecting for years.

But Williams’ latest comments could just spark it into reality.

The New Zealand All Blacks star is preparing for a charity fight in Sydney on Saturday night dubbed “The Banger Under The Hanger’ against Sophie Monk’s love interest in The Bachelorette Stu Laundy.

But speaking with Fox Sports’ Cody Kaye, he is looking beyond that to a “genuinely serious fight” with the Cronulla Sharks skipper.

A heavyweight slugfest he claims he’d win in a canter.

“If I got fit, had a good campaign, I’d be able to beat him and beat him comfortably, I’ve got no doubt about that,” Williams said.

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Paul Gallen when he fought Anthony Watts. Source: News Corp Australia

He then mocked Gallen, saying it’s “sad” the pinnacle for the 37-year-old would be taking him on in the ring.

“I don’t lay awake at night wondering, ‘Oh what’s Paul doing? What’s he eating? Is he training? How’s he doing in the boxing scene?’. You know I’m just an avid boxing fan,” he continued.

“Sometimes I get the impression that’s what he does for me, ‘What’s he doing? Who’s he fighting? What’s he saying?’

“I feel a little sad for the bro sometimes if that’s what he harbours as a boxer to get in the ring with me, if that’s his final destination.

“Time will tell if we do get back in the ring, but if I do have a genuinely serious fight again it will be with him.”

It would certainly be easy to promote, and SBW knows it.

“I’m a realist... I’m 33 now. If I did get back in the ring and have another serious fight it would have to be with Paul just because it makes sense and there’s a lot of interest and what not.”

But first things first, he needs to account for reality TV star and Sydney socialite Laundy.

“We’ll get in there and have a bit of a laugh but also understand that it’s for such a great cause and that’s the underlying message... God willing we can raise some really good money on the night.”

The charities involved include the Rev. Bill Crewes Exodus Foundation and Auckland City Mission.

— Watch Sonny Bill’s fight from 7.30pm Saturday on Fox Sports 506