From 1990 to 1992, Vairo served as head coach of HC Milano Saima. He led the team to a first-place finish during the 1990–91 season, and were the Serie A playoffs champions. He returned for the 1991–92 season, and coached the team to third-place finish, and reached the Serie A playoffs finals. He was also an assistant coach of the Italy men's national ice hockey team in Group B at the 1991 Men's Ice Hockey World Championships. Italy won all seven games played, and earned promotion to Group A at the 1992 Men's Ice Hockey World Championships, and a berth in ice hockey at the 1992 Winter Olympics.