Catalan full-back Brent Webb could miss the rest of the season with a back injury.
Webb, 33, picked up the injury in the recent match at Warrington, and a timescale of four to six months has been set on his return.
Head Coach Laurent Frayssinous said: “It’s obviously a really bad news, especially after Scott Dureau surgery. They are two key players in the squad and two of the best players at their position in Super League.
“The team had to face a couple of bad news since November and has always found the strength to overcome that.
Webb only joined the Dragons from Leeds in the close season.