 On 26 July 2018, in his first competitive game, he scored a late goal against Dynamo Brest in the Europa League second qualifying round as Atromitos came back from 4–0 down to lose the first leg 4–3; they conceded a late equaliser in the second leg after Koulours had a goal disallowed and were eliminated.On 25 August, in his first Super League game of the 2018–19 season, he scored a brace sealing a 2–1 away win against rivals Panetolikos.On 7 October, he scored with a header sealing a 1–0 home win game against PAS Giannina.