World Rugby is to consider introducing the 20-minute red card as a global law trial despite concerns that it could diminish the deterrent effect.
The law, which is being trialled in Super Rugby, means the dismissed player can be tactically replaced by a substitute after 20 minutes.
England lock Charlie Ewels was sent off after 82 seconds against Ireland in the Guinness Six Nations last month, with many observers feeling the dismissal ruined the game as a contest.
