Scarlets and Wales full-back Liam Williams is more than conscious of the threat posed by Clermont wing Sitiveni Sivivatu.
The former All Black has been in sensational form in the Top 14 and Heineken Cup.
After three rounds in this season's competition, Sivivatu has made the most metres (380), clean breaks (9) and beaten more defenders (17) than any other player.
Containing the 31-year-old is no easy task and Williams, capped eight times by Wales, is full of praise for his opponent.
"He's everywhere, off the edge of rucks and anywhere the ball is," Williams told the South Wales Evening Post.
"He's unbelievable, he's class. You've just got to take his legs away."
Assessing the 32-11 loss to Clermont last week in France, Williams revealed that training had been light in order to recover from the physical confrontation before the return fixture at Parc y Scarlets.
"We made a lot of tackles last weekend and there has been a few battered and bruised bodies in the camp," added Williams.
"We have got a fairly light training week and, hopefully, we can hit the ground running on Saturday.
"We need a win, we're on six points now, Clermont are on 10 so it's like a cup final for us. It's make or break."