Born in
Vannes, Zanko started his playing career with
Laval, and made his debut for the reserve team in the 1980–81 season. He played his first senior match for the club four years later and went on to score two goals in 27
Division 1 matches during the 1984–85 campaign. In the summer of 1985, Zanko joined Division 2 side
Racing Paris, where he made 26 first-team appearances. At Racing he was a part of the team that won the Division 2 Group B in 1986. In the summer of that year he switched clubs again, signing for
Tours. Zanko spent two seasons with the club, during which he played 58 league matches. In 1988, Zanko transferred to Division 2 Group A side
Dunkerque. He made a total of 37 league and cup appearances during his first season at the club, and scored his first goal for Dunkerque in the 3–1 away win over
Le Mans on 22 April 1989. Zanko spent two more years with the team, playing in a further 53 league matches. He moved to
Division 3 outfit
Valence in the summer of 1991, and scored once in 30 appearances as the side won promotion to Division 2 at the end of the 1991–92 season. The following season, he played 28 matches, again scoring once, as the team finished fifth in their group to secure their place in the new nationwide
Ligue 2. Zanko played two more seasons with Valence, making a total of 50 league appearances. ==Coaching career==