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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The tournament kicks off with Australia hosting world champions South Africa in Brisbane on Saturday (06:45 SA time).
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