World Rugby will introduce new tackle rule trial for the under-20 world championship starting next week in France

Currently, tacklers can make their contact in line with the shoulders but World Rugby research has found the risk of injury to both players is 4.3 times higher when the tackler is upright.

A high tackle warning will be issued at the under-20 championship if the tackler does not behind at the waist when tackling and there is clear head contact made for either player.

Two high-tackle warnings for the same player will trigger a one-match ban.

World Rugby research consultant Ross Tucker says for now it's just under20 level.

He says they'll trial at the under-20s and will apply it elsewhere if needed.

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