Following two additional seasons with St. Louis, he was recruited by GM Bill Torrey to take over a young New York Islanders team that had set a then-NHL record for futility by winning only 12 games in their inaugural season, 1972–73.
Al Arbour, four-time Stanley Cup-winning former coach of the New York Islanders
During his eight seasons with the Islanders, coach Al Arbour used Tonelli on the famed "Banana Line" with Wayne Merrick and Bob Nystrom, on the top line with Bryan Trottier and Mike Bossy, and later he played flank for Brent Sutter and Patrick Flatley.