In January, it was announced that this year's Six Nations will use 20-minute red cards for the first time.

Lawmakers say the 20-minute red card trial is designed to "punish the player and not the team", with sides able to replace a dismissed player after 20 minutes instead of playing the rest of the game with 14.

Ireland centre Garry Ringrose got his timing wrong on a big first-half hit on Wales' Ben Thomas and his high tackle was later upgraded to red.

With Ireland down to 14, Wales had their best period of the match and scored a superb try in the corner through Tom Rogers.

Once the 20 minutes passed, Bundee Aki replaced Ringrose and played a key role in seeing the game home for Ireland.

"Ringrose is an exceptional player and defends so physically but in my opinion those collisions need to be out of the game," Barclay said.

"That is a player who has made a decision to fly in. In my view, and a lot of other people, that should be a straight red card."

Warburton says players' behaviours have not changed enough since he retired in 2018.

"There needs to be a much firmer punishment on individuals off the field," he said. "If Ringrose gets a one or two-week ban then he is going to do that again.

"A four-week ban and he probably doesn't do that tackle again. We need to punish the player individually much more harshly off the field."