Daryl Millard and Damien Cardace have added to Catalan’s injury list ahead of the Easter weekend.
The pair were both injured in the game against Widnes last Saturday, and miss the trip to London on Thursday.
They join long-term injured Scott Dureau, Brent Webb and Ian Henderson on the sidelines, while Louis Anderson has also not fully recovered from injury in time.
There are returns, however, for Antoni Maria and Mathias Pala.
The Dragons face the Broncos at The Hive on Thursday, before returning to France to take on Hull KR on Monday.
Catalan 19-man squad v London: Escare, Pryce, Pomeroy, Oldfield, Bosc, Elima, Lima, Taia, Mounis, Maria, Pelissier, Whitehead, Pala, Bousquet, Paea, Baitieri, Duport, Garcia, Guasch.