Grenoble are set to be without prop Sona Taumalolo until the end of the month after he suffered a foot injury last weekend.
The former Chiefs front-row was injured in Grenoble's heavy loss to La Rochelle on New Year's Day.
Club boss Bernard Jackman told Rugbyrama that Taumalolo will not be available for this weekend's must-win Top 14 clash against Brive, hoping that he will be fit by January 28 for the clash with Stade Français.
"After this weekend, we have 10 games left (in the Top 14). We need Sona Taumalolo to be 100 percent," he said.