With 4,970 points scored as a member of Aris, he is the second highest scorer of all-time in the history of the club, after Nikos Galis.
[4] Still in his playing years, Ioannidis agreed to assume the head coach position at Cretan club Ergotelis in 1977, after being offered the job by longtime friend and fellow Aristotle University of Thessaloniki student Manolis Nikiforakis.
[5] Travelling back and forth between Thessaloniki and Crete, Ioannidis managed to promote the club to the Greek B Basket League.
With Aris, he also participated at three consecutive FIBA European Champions' Cup (EuroLeague) Final Fours.
Ioannidis was the architect of the most glorious victory of Olympiacos, which came against Panathinaikos, in the last game of the 1995–96 Greek League Finals, with a winning score of 73–38.