Governing body Sanzaar said on Tuesday that 20-minute red cards will be among the rules changes for the 2024 Rugby Championship, which starts on Saturday.
In certain cases under the new rules, players sent off after being shown a red card can be replaced by another player 20 minutes later.
The rationale is that individual players, not the match, are punished for some red card offences, Sanzaar said in a statement.
However, deliberate foul play with a high level of danger will still result in a full red card for the offending player, who can neither return nor be replaced, Sanzaar added.
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