Athanasiadis was subbed in the game vs Marseille in Velodrome after starting goalkeeper Cican Stankovic received a red card and caused a penalty in the second half.
Athanasiadis kept a clean sheet vs Aris on 4/12/2023, helping AEK clinch a tight 1-0 victory.However in the summer transfer window of 2024-25 season,with the arrival of Alberto Brignoli and Thomas Strakosha,him along with his fellow goalkeeper,Cican Stankovic were sidelined and were asked to find another team for them to play for.
[4] The Greek keeper had a vital contribution in the qualifying phase and play-off round, keeping six clean sheets in eight matches.
[8] Athanasiadis was called up by the senior Greece side for the 2022–23 UEFA Nations League matches against Northern Ireland, Kosovo and Cyprus in June 2022.
He substituted Odysseas Vlachodimos in the 78th minute, as Germany scored the last-minute goal to finish their comeback in a 2–1 victory.