John Nyskokus enjoyed a long and successful playing career that included 36 games for Australia, 22 of them full internationals. He also represented South Australia on 26 occasions. In 1976 Nyskohus toured overseas with the Australian team and played in the 1978 World Cup qualifying rounds. Nyskohus enjoyed great success with Adelaide City in the National Soccer League, switching to coaching the club after retirement in 1983. He is a Players Life Member of the South Australian Soccer Federation.