[1] Born on February 18, 2000, he became a member of the Giannitsa Sports Academy, moving through all the age level groups until he was 16, when he joined PAOK.

A left-footer, Michailidis is also talented with the ball at his feet, standing out for his accurate long passes and the maturity he shows in his game.

With full seasons with PAOK, first in U-17 and then in U-19, he celebrated with his teammates three consecutive championships and an incredible series of 70 games without defeat, while he also wore the team jersey at UEFA Youth League.

In March 2019, he was promoted to the first team of PAOK and start playing in the last matches of the 2019–20 playoffs, while he scored his first goal against OFI on 4 July 2020, in an away draw 2–2.

Giannis Michailidis traveled on Sunday (3/4) in the morning to Portugal where on Monday (4/4) he will undergo the necessary surgery to overcome his serious knee injury.