Rhys Priestland has revealed Wales' RBS 6 Nations squad have reiterated among themselves the need for watertight discipline in Test matches.

Lock Bradley Davies will miss the rest of this season's tournament after collecting a seven-week ban for a reckless tip-tackle on Ireland replacement Donnacha Ryan in Dublin last Sunday and is the second Wales player suspended for that offence this season following Sam Warburton's three-week punishment for an incident in the World Cup semi-final against France.

"He (Davies) knows that he shouldn't have done it," Wales fly-half Priestland said. "It is one of those heat of the moment things. He didn't try to do it, but looking back he knows how silly it was."

He added: "We spoke about it as a team this week. We can't let our discipline cost us games.

"I don't think any player goes out to do it, it is just one of these things that happens in a game, and it is just important that we try to stop it happening as often as possible.

"I am not sure if it is a technical issue. I sort of tip-tackled Jonny Vaughton (ex-Ospreys wing) once, and as soon as I picked him up I knew that he had gone and what I had done, but it had already happened and I couldn't stop it."

Wales, meanwhile, are confident they can avert any threat of a second-row crisis after losing Davies following the 23-21 victory over Ireland.

Cardiff Blues forward Davies, subject to any successful appeal, cannot play again until March 26, nine days after the competition finishes. He joins his fellow World Cup locks Luke Charteris and Alun-Wyn Jones, who are both injured, on the sidelines.

Wales coach Warren Gatland will announce his team to face Scotland on Thursday afternoon, with former captain and back-row regular Ryan Jones widely expected to take Davies' number four shirt.

Jones, who starred at blindside flanker against Ireland, has played lock for his regional team the Ospreys this season, and would be the obvious replacement for Davies, although Gatland also has uncapped Scarlets second-row Lou Reed in the Six Nations squad.