Wales assistant coach Robin McBryde said that prop Joe Marler will be watched at scrum time in their clash with England at Twickenham on Saturday.
South African referee Craig Joubert returns to international duty since last year's quarter final in the World Cup.
McBryde believes that the ability of Joubert to control the scrum situation is of a high pedigree.
"We have a very experienced referee in Craig Joubert," McBryde told the Western Telegraph.
"He's an extremely good communicator with the players, and (Wales captain) Sam Warburton enjoys working with him."
Asked whether the questions around Marler's scrumming technique will be addressed in the match, McBryde concedes that if need be it will be addressed.
"Well, yeah, he definitely needs to scrummage legally, otherwise we will be pointing a finger," he said.
"You have to measure each scrum on its own merits with regards to who gets the upper hand.
The forwards specialist has however applauded both pack of forwards for their ability to dominate the set-piece at times, he has made positive remarks about the English scrumming ability.
"I can't see it being a problem on the day, because both teams have a positive attitude to scrummaging. That is what we will be focusing on."
Last time these two teams met Wales had the upper-hand by recording an emphatic 25-28 vicotry in the World Cup last year September at the same venue.
McBryde has admitted that they are improving and are full aware of the steam that England have gained from their victories.
"They (England) have got the bit between their teeth, and they have obviously created quite a bit of momentum with three wins out of three.
"They are sitting pretty and not too far away from where they want to be.
"I think we have steadily got better and better as the tournament has gone on. The longer we spend together, the better we seem to get."