Australian centre Matt Giteau is a doubt for this weekend's Top 14 clash for Toulon against Toulouse.
Giteau is rated as "uncertain" by his club due to a rib injury picked up in the Heineken Cup defeat to Cardiff Blues.
The former Wallaby has been in excellent form for the European champions so far this season, scoring 70 points including five tries in the league.
Second row duo Ali Williams and Bakkies Botha have both been ruled out with back and elbow injuries respectively, whilst Michael Claassens is a long-term absentee.
Toulon are level on 27 points with Toulouse at the head of the Top 14 along with Montpellier, currently sitting in first place on points difference.