Spiranovic received a call up to a 20-man Australia U–20 national team squad for a five-match tour of South America in August 2006. Spiranovic participated in matches against Colo-Colo U–20, Universidad de Chile U–20, Chile U–20 and Argentina U–20. The South American tour was preparation for the 2006 AFC Youth Championship, the qualification campaign for the eventual 2007 FIFA U-20 World Cup. Spiranovic was selected to play at the 2006 AFC Youth Championship held in India. Australia finished in second spot of their respective group after losing to China (1–0) and defeating Thailand (3–1) and the United Arab Emirates (2–0). Australia advanced to the quarter–finals where they were defeated 2–1 against South Korea and failed to qualify for the 2007 FIFA U-20 World Cup.