 Riendeau would spend the 1986–87 and 1987–88 seasons playing for Montreal's minor league affiliate, the Sherbrooke Canadiens of the AHL.In his first professional season, Riendeau was awarded the Harry "Hap" Holmes Trophy for allowing the fewest goals-against in the AHL.Despite posting winning records in the minors, Riendeau suffered in his only appearance for Montreal during the 1987–88 season, in which he allowed 5 goals in 36 minutes.