Stade Francais scrum-half Julien Dupuy looks likely to miss at least three weeks of Top 14 action due to a torn groin muscle.
The 28-year-old tore the muscle during Saturday's 30-22 defeat at the hands of Bordeaux-Begles.
"Torn groin muscle. Really a sh*t start to the season," Dupuy wrote on Twitter.
Eight-times capped Dupuy is a crucial player for the ailing Parisian club, who lie third from the bottom having lost three and won just one of their opening five games.
Stade's next three matches see them host Perpignan, who are coming off an impressive win over defending champions Toulouse, and then tough away trips to 2010 champions Clermont and fourth-placed Castres.