Lettieri began his pro career with the
Montreal Castors in the
National Soccer League in 1976. In 1977, he played with the
Minnesota Kicks in the
North American Soccer League and played there until 1981. He went on to play the
Vancouver Whitecaps in 1982 and 1983 and the
Minnesota Strikers in 1984. He was named NASL North American Player of the Year in 1983 and had the league's best Goals Against Average in both 1982 and 1983. Lettieri was a regular in the original
MISL. He continued to play for the Strikers as the team joined the indoor league, playing the 1984–85 season through to 1987–88. Lettieri was voted Goalkeeper of the Year for the 1986–87 season. Lettieri led the Strikers to a runner-up finish in the MISL playoffs during the 1985-86 season, as the team fell 4-3 in the championship round to the San Diego Sockers. Two years later, the Strikers won the Eastern Division. Lettieri finished his outdoor career in 1987 with the
Hamilton Steelers in
Canadian Soccer League. He was elected to the
Canadian Soccer Hall of Fame in 2001. Lettieri is often remembered for his keeping a stuffed parrot in the back of his net during games. The bird was named "Ozzie". In 1985 the league banned Ozzie from the nets. ==International career==