World Rugby is considering adopting 'orange cards' for the World Cup, according to the governing body's head of match officials.
A form of the yellow card review system is currently being trialled in Super Rugby Pacific and it could be fast-tracked into the global showpiece hosted by France this autumn.
While players can still be given a red card for instances of foul play, the referee has the option of showing a yellow that can then be upgraded to red on review by the TMO.
The idea of the initiative is to speed up the game by reducing the number of on-field replays of incidents while also dealing with contentious decisions, such as the dismissal of England full-back Freddie Steward against Ireland last month.
Steward was controversially sent off for a dangerous challenge on Hugo Keenan during the 18 March Six Nations encounter in Dublin, but the card was subsequently rescinded by a disciplinary panel.
"This is an operation being tested in Super Rugby," World Rugby's Joel Jutge told Midi Olympique.
"In the event of a 50-50 decision, the referee has the possibility of giving a yellow card so that the game can resume as soon as possible, while the TMO has 10 minutes of temporary expulsion to decide whether this should be turned into a permanent expulsion.
"We would give orange cards, clearly."
Watch Lions v Leinster (Saturday 3pm), Stormers v Munster (Saturday 5.15pm) and Connacht v Cardiff (Saturday 7.35pm) on RTÉ2 and the RTÉ Player or follow live scores on RTÉ.ie/Sport and the RTÉ News app.
Follow a live blog for Italy v Ireland in the Women's Six Nations (Saturday 4.45pm) on RTÉ.ie/Sport and the RTÉ News app or listen to live radio commentary on Saturday Sport on RTÉ Radio 1.
