Mounis, 29, is the first player to have surpassed the 200 Super League game mark with Catalan, and he is set to enter his fourth season as co-captain.
Dragons head coach Laurent Frayssinous had this to say:
“Both are natural leaders, and are very highly respected players within our group.
“They are an example on and off the field, and I think they complement each other very well.
“They will be heavily supported by a number of other players who show great leadership.”