Racing-Metro have replaced injured prop Brian Mujati with 21-year-old Walter Demaison in their Heineken Cup squad.
Former Springbok and Northampron prop Mujati has a leg injury and missed last week's opening round victory over Clermont.
Clubs are limited to a squad of 38 players but are allowed to add two additional players over the course of the pool stages as injury replacements. One of those players must be a front rower. De-registered players may be re-registered (in place of the relevant additional players) during the pool stage.