France winger Menez was replaced in the first half of the 2-1 league home loss to nine-man Stade Rennes on Saturday after he picked a thigh problem.
PSG did not specify what injury Gameiro had.
The French side will join group leaders Porto in the last 16 if they do not lose against a Kiev team they thrashed 4-1 at home in September.
- Sports & Recreation
- Stade Rennes