He hooked up with the Montreal Canadiens' organization in 1969 where he spent most of the year playing for the Montreal Voyageurs of the AHL. Cracking a Habs' lineup replete with star forwards would prove to be very difficult. In his second year with the organization, however, he did manage to dress for 39 games in which he showed some promise, netting 21 points. He then stayed on for a playoff run, culminating in a Stanley Cup victory against the Chicago Blackhawks in 1971. Roberto played in 385 NHL games and scored 75 goals and 106 assists.