Clermont and France hooker Benjamin Kayser has described departing head coach Vern Cotter as a "great leader of men."
Cotter finally brought Clermont success in the Top 14 with a title in 2010 and lead les Jaunards to the Heineken Cup final last season.
The New Zealander is set to take over a head coach of Scotland and a European title would undoubtedly be a fine end to his stint in France, with Kayser opening up on his coaching style.
"He's ruthless: all the great coaches I've met in my career are the same, great leaders of teams and men," said Kayser.
"He's extremely hard working, knows his direction, and he's just a real captain of the ship and that's what you expect from the boss.
"He will boss guys around and make sure that he pushes them to their absolute best.
"I think his management has evolved drastically, he came to the club and he had to impose a winning culture and impose his way of thinking.
"And gradually he has given a lot of us the management and leadership power to a few key guys within the team.
"And he's just the boss, on top of that, who is piloting everything. So I think he's really shown his smart management. But it's not because it's his last year at Clermont that we want to do something, he has never mentioned it once.
"He just wants us to win and to finally go to our full potential, not for him but just for the whole team and the whole club."
Kayser added that he wasn't thinking about the last time the two sides met, when Clermont handed out a beating to their hosts at Vicarage Road in the Heineken Cup quarter-finals of 2012.
"It would be the perfect trap for us to think about the past," added Kayser.
"Before we think of any final or anything like that, we've got a huge mountain to climb on Saturday with Saracens at Twickenham."