Career
Club playing career
Giannouzakos began playing club basketball with the Greek club XAN Thessaloniki (Young Men’s Christian Association) in 1964. He moved to AEK Athens in 1974. He then joined Aris in 1981.
Greek national team
With Greece"s senior men"s national team, he had 147 caps, and he scored 956 points (65 points per game).
With Greece"s senior men"s team, he played at the 1972 International Basketball Federation World Olympic Qualifying Tournament, the EuroBasket 1973, the EuroBasket 1975, and the EuroBasket 1979. After he retired from his playing career, Giannouzakos became a basketball coach.