Roy was placed on waivers by the Mammoth on Friday for the purpose of assignment to AHL Tucson.
After signing a one-year, two-way contract with the Mammoth in late June, Roy is on track to begin the regular season in the minors if he clears waivers. He made 57 regular-season appearances for AHL Laval last year and racked up 23 goals, 22 assists and 32 PIM.