Roger Tuivasa-Sheck gained 20 international appearances for the All Blacks before transferring allegiance to Samoa.
Australian rugby league's administration has stated that participants who enter the “counterfeit” R360 competition will be barred for a decade.
The new league, set to start in 2026, is seeking to lure athletes from both codes with substantial agreements and a condensed game calendar.
Leading rugby league athletes have reportedly been approached by R360, which will involve multiple men's sides and four women's teams based in major cities worldwide.
Representing Samoa the rugby star, who represents New Zealand Warriors in the competition, has confirmed he has had negotiations involving the breakaway league.
Ryan Papenhuyzen, Zac Lomax, Payne Haas and Jye Gray are also said to be considering joining R360.
Eight major union nations, including Australia, earlier declared a prohibition on athletes signing with R360 appearing in international matches.
“We heard our clubs and we've acted decisively,” commented ARLC chief V'Landys.
“Sadly, there will continually be organizations that attempt to hijack our sport for potential financial gain.
“They fail to contribute in talent pipelines or the growth of players. They only leverage the efforts of existing bodies, jeopardizing careers of financial loss while benefiting financially.
“In truth, they represent, copying the game.”
The organization is established by retired international Mike Tindall and supported by private investors.
After the prospective rugby union prohibitions were declared earlier, it said: “We aim to collaborate together as integrated into the global rugby calendar.
“The competition is structured with tailored timetables for men's and women's teams and we will release all players for test matches, as specified in their deals.”
The new league will apply for endorsement for its initiatives from the international authority, rugby union's governing body, at its board session next year.