At the 2012 Ivan Hlinka Memorial Tournament, Petan helped Canada's under-18 team win the gold medal. During the 2013–14 season, he represented the WHL in the Subway Series, then played for Canada's under-20 team at the 2014 World Junior Ice Hockey Championships. He was invited back to represent Canada at the 2015 World Junior Ice Hockey Championships, where he was instrumental in Canada's gold medal win, including scoring a hat-trick against Slovakia in the semi-final.