[2] On 8 July 1991, Dimitriadis changed the yellow shirt of Aris for the yellow-black of AEK Athens by signing a 2-year contract, on a transfer that cost over 100 million drachmas.
[3] On 6 November 1991 Dimitriadis scored the decider goal in the home match against Spartak Moscow, which gave AEK the 2–1 win and the qualification to the third round of the UEFA Cup.
[7] On 21 October 1992 he scored the winner with a beautiful header in the home win against PSV Eindhoven for the second round of the UEFA Champions League.
[12] In the summer of 1994, the additions of Saravakos, Ketsbaia and Kostis in the team's offense made the competition difficult for Dimitriadis who managed to score 8 goals in the league.
[3] In the summer of 1996, AEK acquired Demis Nikolaidis from Apollon Athens in which Dimitriadis was said to be one the exchanges for the transfer.
Confused, he requested to leave the club, but then owner and president of AEK, Trochanas stated that the whole case was a misunderstanding.
[19] In 1998 Dimitriadis became the general leader and the head of the football department of AEK for one season, later returning to the same role from September 2009[20] until the summer of 2012.