Antoniadis scored 187 goals in 242 matches in the Greek Championship, and was top scorer five times: 1970 (25 goals), 1972 (39 –second in Europe- record in the Greek Championship until today), 1973 (22), 1974 (26) and 1975 (20).
In 1971 when Panathinaikos reached the European Cup Final against Ajax, Antoniadis was the leading scorer in the tournament with 10 goals.

During the summer of 1978 he was transferred to Olympiakos where he stayed for one season, playing in 13 games and scoring 7 goals.
He later went on to play for Atromitos Athens.
In 1980 before he retired and became president of PSAP he went full circle and returned to Panathinaikos.
Antoniadis was a very accomplished header of the ball and possessed a strong shot.
He made 21 appearances and scored 6 goals for the Greek national team between 1970 and 1977.
He is the vice-president of the football team of Panathinaikos since the summer of 2008.
Antoniadis scored 187 goals in 242 matches in the Greek Championship, and was top scorer five times: 1970 (25 goals), 1972 (39 –second in Europe- record in the Greek Championship until today), 1973 (22), 1974 (26) and 1975 (20). In 1971 when Panathinaikos reached the European Cup Final against Ajax, Antoniadis was the leading scorer in the tournament with 10 goals.
During the summer of 1978 he was transferred to Olympiakos where he stayed for one season, playing in 13 games and scoring 7 goals. He later went on to play for Atromitos Athens. In 1980 before he retired and became president of PSAP he went full circle and returned to Panathinaikos. Antoniadis was a very accomplished header of the ball and possessed a strong shot. He made 21 appearances and scored 6 goals for the Greek national team between 1970 and 1977. He is the vice-president of the football team of Panathinaikos since the summer of 2008.
Antonis Antoniadis