Catalan scrum-half Scott Dureau has been ruled out for four months with an arm injury.
Dureau, 27, suffered a bicep tendon rupture in the defeat to Castleford on Sunday, and will undergo surgery in France tomorrow.
The Australian missed a large part of last season after undergoing surgery on a tumour behind his eye.
The Dragons will also be without Damien Cardace for the visit of Leeds at the weekend, with an ankle injury.
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