Iarusci played 27 times for Canada from 1976 through 1983 and captained the team for a number of games. He scored twice, both in qualification for the 1982 World Cup and playing as sweeper. The first goal on November 1, 1980, in a 2–1 win over the U.S. in Vancouver and the second in Canada's last match of the 1981 CONCACAF Championship tournament against Cuba. The game finished 2–2 and Canada, along with Mexico, failed to qualify for the World Cup, finishing a point shy of second place qualifier El Salvador.