Clermont hooker Benjamin Kayser believes that Jonathan Davies and Nick Abendanon are playing their best rugby at the club.
Abendanon was named Man of the Match and is enjoying an excellent first season in France, as Clermont advanced to the Champions Cup semi-finals.
Northampton were completely dismantled at the Stade Marcel Michelin and Kayser put the hugely impressive 37-5 victory down to good preparation and plenty of passion.
"The club has been doing great for the last few years, targeting some great players," said Kayser.
"And players like Jonathan Davies and Nick Abendanon, everyone knows they're great players, but they've applied themselves properly here.
"We've had some good games. But when you put your heart into it and prepare properly, everything comes together and it did for us in the first half.
"It was a great performance and we're very pleased to be in the semi-finals."
Clermont will face either Racing Métro or Saracens in the semi-finals.