"James underwent a surgical procedure on the night of the game to repair a lacerated ear and is now following medical advice to enable it to heal properly," said Towers.
"The expectation is that it will around four weeks before he will be in a position to take contact again, and as such we are working to get him back playing within those timescales."
Meanwhile, there's good news regarding Richard Fussell, who has been out since injuring his ankle in the pre-Christmas Heineken Cup game against Saracens at the Liberty Stadium.
Towers commented: "Richard is entering the final stages of rehab and is doing well. We should be in a position next week to make a decision regarding availability for the Biarritz game, but I'd say he has a realistic chance of being available for selection."