France winger Christophe Dominici could be sidelined for up to three weeks after sustaining a hand injury on club duty with Stade Francais at the weekend.
The 34-year-old looks to have damaged tendons in his right hand and he will have a scan to determine the extent of the problem.
Dominici suffered the injury towards the end of Saturday's 27-14 win over Montauban in the Top 14.
'We are going to see if it is necessary to operate or not,' said Stade doctor Alexis Savigny.
'It is possible there is a tear. If we have to operate, he could be out for a maximum three weeks.'
If Dominici is ruled out for the three weeks, he would miss top-of-the-table Stade's final three games of the Top 14 season, against Biarritz, Perpignan and Agen.