Despite concerns that it could reduce the deterrent effect, World Rugby will consider introducing the 20-minute red card as a global law trial.
The law, which is being trailed in Super Rugby, means a substitute after 20 minutes can tactically replace the dismissed player.
Last month, Charlie Ewels was given a red card after 82 seconds against Ireland in the Guinness Six Nations, with many observers feeling the dismissal ruined the game as a contest.
However, World Rugby is determined to keep lowering tackle heights, and the Super Rugby trial has proven to be indecisive.
“That’s been discussed before and will be discussed again,” World Rugby chief executive Alan Gilpin told the Daily Telegraph.
