DRAGONS number eight Ross Moriarty has heeded a warning about avoiding his red mist to lead the charge and put Wales on the brink of a Grand Slam, according forwards coach Robin McBryde.

The powerful back row forward will be a leading figure against Ireland in Cardiff on Saturday as Warren Gatland's men bid for a first clean sweep since 2012.

Moriarty has made 44 carries and put in 48 tackles after starting in the wins against France, England and Scotland plus coming off the bench in the success against Italy

The 24-year-old has been combative yet disciplined after being given a pre-tournament warning by head coach Gatland because of his summer red card for a choke-hold against Argentina.

"He loves playing for Wales, wants to win and has that bit of an edge about him," said Gatland.

"We've got to make sure that red mist doesn't come down too quickly, because it can come down pretty fast."

Moriarty's subsequent Six Nations displays in the back row along with Josh Navidi and Justin Tipuric have earned the praise of McBryde.

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"He's matured massively and played a big role in all the games for us," he said. "The more game-time and exposure you have at international level, you just take it in your stride. You're more familiar with what's being asked of you and that's the case with Ross.

"I've been pleased with his accuracy and ball-carrying – he must have caught every restart against Scotland and returned it with interest.

"His composure at the base of the scrum has improved and his understanding with the scrum-half.

"He's as effective without the ball as he is with it, in defence putting the shots in.

"His all-round composure and game management for the whole 80 minutes has been excellent – he has really stood up."

McBryde has, however, issued a team warning about keeping their cool in the red-hot Cardiff atmosphere on Saturday.

After being disciplined against England, Wales got on the wrong side of French referee Pascal Gauzere when racking up 11 penalties last weekend and cannot afford a repeat.

"We have got to be disciplined, that's one thing we have got to improve from the weekend against Scotland because we gave them numerous opportunities within 10 metres of our try line," said McBryde.

"As Ireland showed against France, if you give them the same opportunities, they will take them. You have got to be disciplined otherwise you are going to given them an opportunity to get in your 22.

"They are pretty clinical when they get into that area of the field so, first and foremost, we have got to be squeaky-clean, very disciplined but try and put them under pressure."

Australian Angus Gardner is the man in charge for Saturday's clash.