"Tell my good friend Paul, he can just relax and we will get there eventually," SBW told the Sydney Morning Herald. "He keeps calling me out by attacking me and questioning my manhood. That kind of talk, I'm past that stage in my life.
"I've been involved in sports for long enough to understand that the bravado, the macho talk is just rubbish. That's just water off a duck's back to me, so to speak. That's what I'd say about that situation brother."
Pressed on whether he intended to take on the veteran Sharks forward - who is now eyeing off a fight with John Hopoate - Williams replied: "Yeah, of course. When it comes to my good friend Paul, he probably needs to relax a bit.
"If it happens, it happens. This great opportunity came up for such a great cause. Big Paul had to take a back seat, so to speak."
Williams' opponent, in what will be a sanctioned world title fight, will be named at a news conference in Auckland on September 18. Other sports stars will participate on the undercard.