Springbok loose forward Willem Alberts has sustained a suspected torn bicep while playing for Stade Français and faces a lengthy spell on the sidelines.
The former Cheetahs centre crossed the line during his side's Top 14 match against Toulon.
Former All Black Ali Williams will join ex-teammate Dan Carter as his media advisor at Racing 92.
Heini Adams scored a late try as Bordeaux stunned Stade Français 24-21 in the Top 14, while there were also wins for Toulon, La Rochelle, Castres, Toulouse and Clermont.
Springbok hooker Bismarck du Plessis is relishing the chance of playing under Jake White at Montpellier.
SARugbymag.co.za looks back at the past weekend's English Premiership, French Top 14 and Celtic Pro12 matches, involving South African players.
Demetri Catrakilis scored 20 points as Montpellier beat La Rochelle 25-20 in the French Top 14, while Toulon, Castres, Racing, Bordeaux and Brive also won.
Springbok wing Bryan Habana has signed a one-year contract extension with Toulon.
Springbok flyhalf Morné Steyn has signed a new two-year deal with Stade Français.
Toulon returned to winning ways with a crushing 52-8 bonus-point victory over Montpellier in the French Top 14 on Saturday.