Eight international rugby unions, including New Zealand, have warned players that they won't be eligible for high-level selection if they switch to the proposed Rugby 360 league.

There have been rumours of monetary offers directed at high-level rugby and league players for the competition, which is being promoted by former England international Mike Tindall.

NZ Rugby CEO Mark Robinson says many of the other unions haven't been as clear or public as New Zealand's has, because of the scrutiny, but they wanted to make things clear.

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