Ilias Kostis

In 2019, Kostis joined the youth academy of Spanish La Liga side Atlético Madrid from APOEL. Promoted to the reserves in 2022, he quickly established himself as a starter before renewing his contract until 2027 on 9 February 2023. After helping in the B-team's promotion to Primera Federación, Kostis made his first team debut with Atleti on 4 October 2023, coming on as a late substitute for goalscorer Álvaro Morata in a 3–2 UEFA Champions League win over Feyenoord. In December, however, he suffered a serious muscular injury which sidelined him for nearly six months. Back to action in May 2024, Kostis regained his starting spot at the B's before suffering a knee injury in October 2025, being sidelined for the remainder of the season. On 31 July 2026, he signed a four-year deal with Segunda División side Castellón.

Born in Greece, Kostis represented Cyprus up to the under-21 level, before switching allegiance back to Greece to play for their own under-21 squad in 2023.