Lauret, who sustained the injury in his team's 19-14 league loss to Toulouse on Friday, has been replaced in the 33-man squad by Toulon's Pierrick Gunther.
Manager Philippe Saint-Andre will trim his squad to 23 players on Monday before next Sunday's Six Nations opener against Italy in Rome.
"Our first concern is the players' health. Wenceslas gave a lot for his club and he must rest," Saint-Andre said in a statement.
- Sports & Recreation