Former Leicester lock Steve Mafi is among seven new recruits signed for next season by Castres.
A new father and some former Super Rugby stars feature in our team of the week along with a World Cup winning fly-half.
Team of the week includes strong semi-finalists and leaders of the pack from the Top 14 and Super Rugby.
Harlequins are looking to extend their unbeaten run as they take on Montpellier in Friday's Challenge Cup action.
Johnny Leota secured a last-gasp bonus point to keep Sale Sharks' Challenge Cup quarter-final hopes alive.
England hopeful Josh Beaumont skippers Sale against Pau while the Dragons welcome back Hallam Amos for the visit of Castres.
Castres came from behind to beat Pau 30-21 in their European Challenge Cup Pool 2 clash at the Stade du Hameau.
Harequins crushed Calvisano, Sale beat Castres, while Brive and Zebre posted easy wins in the European Rugby Challenge Cup.
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