Scotland lock Richie Gray will leave Castres for Top 14 rivals Toulouse at the end of the season.
World Cup winner Ben Franks could make his London Irish debut in Saturday's Challenge Cup trip to Grenoble.
All of this weekend's Champions Cup and Challenge Cup games in France have been postponed due to the tragic events in Paris on Friday night.
All the team news ahead of Saturday's Challenge Cup matches, including London Irish v Agen and Gloucester v Zebre.
Ten clubs are represented in our team of the week, which includes George Smith and hat-trick hero Gael Fickou.
Toulon have opened their season with back-to-back defeats for the first time in a decade after losing 24-9 at Castres.
European Challenge Cup holders Gloucester will face local rivals Worcester Warriors in the 2015-16 competition.
Lionel Beauxis missed with the last kick of the game to cost Bordeaux-Begles a place in the Top 14 play-offs.
More of the games that matter on Sky Sports
Rugby Union news, direct to your mobile
A Day Pass for only £6.99. No contract
Win in our free to enter competitions section
We've a host of top class rugby union action