[2] At the age of 8, after moving from Kazakhstan to Greece, he started training, in wrestling and kickboxing at Malios Team.
Few months later his next successful appearance was in the United Arab Emirates to fight at Abu Dhabi Warriors 4 against Ion Pascu, where he won via unanimous decision.
[8] Michailidis lost the bout via TKO after he could not get up at the end of the round due to a series of elbows to the side of the head.
[10] Michailidis was expected to face Antônio Arroyo at UFC Fight Night: Felder vs. dos Anjos on November 14, 2020.
[12] Michailidis faced KB Bhullar at UFC on ESPN: Reyes vs. Procházka on May 1, 2021[13] He won the bout via unanimous decision.
[20] In the Quarterfinals, Michailidis faced Marcel Grabinski on June 17, 2023 at Oktagon 44, winning the bout and advancing via second round arm-triangle choke.