[1] Fillios began his pro career in the Greek A2 Basket League with Iraklis Thessaloniki, in the 2018–19 season.
The next year, he debuted in the Greek Basket League in a game against Ionikos Nikaias.
On July 11, 2023, Fillios joined Aris Thessaloniki of the Greek Basket League.
[2] On August 14, 2024, Fillios joined AEK Athens of the Greek Basket League.
[3] On December 3 of the same year, he was released from AEK and returned to Aris.