France winger Christophe Dominici will be sidelined until at least the start of next week because of a thigh complaint.
The Stade Francais veteran has not taken part in training this week, with an ultrasound scan revealing an injury to his left thigh muscle.
The 35-year-old will not now train until Monday, when he is scheduled to undergo further tests.
Dominici's Stade team-mate David Skrela, who injured his Achilles in the 17-12 defeat to Argentina on Friday, is expected to lose his crutches at the end of this week.
The fly-half will miss the games against Namibia and Ireland but should be available for Les Bleus' last Pool D match, against Georgia on September 30.