Cardiff tight-head Dillon Lewis will be out until potentially the end of January with a knee ligament injury.
The 26-year-old, who has been linked with a move to England amid the current pay freeze in Wales, last featured against Brive on December 10 and is now not expected to play again until the return fixture with the French outfit on 21 January.
Even that is an optimistic assessment, with Cardiff boss Dai Young admitting that the January 28 clash with Leinster seems a more likely return date.