PAOK In 2012, Koutsias moved to
PAOK from Tilemachos Alexandria. On 18 September 2020, Koutsias made his professional debut in a 1–1 home draw against
Atromitos. Less than three months later on 10 December 2020, he made his
Europa League debut in a 0–0 away draw against
Granada becoming the 16th youngest player in
Europa League's history at the time and the second youngest Greek (after
Charalampos Mavrias).
Chicago Fire On 28 February 2023, Koutsias signed with
Major League Soccer side
Chicago Fire for an undisclosed fee. Koutsias went on to make his debut with the
Chicago Fire on 8 April 2023, coming on as a substitute against
Minnesota United.
Lugano On 13 December 2024, Chicago Fire announced that they would be loaning Koutsias to Swiss club
Lugano on a year-long deal with an option for a permanent transfer, effective 1 January 2025. On 13 December 2025, Lugano made the transfer permanent and signed a two-and-a-half-year contract with Koutsias. ==Personal life==