StadiumŠtadión Karaiskakis
| Current capacity of the stadium |
| Standing | 35 000 |
| Seats | 33 000 |
| Tribune | 29 000 |
| Seats for sponsors | 22 000 |
| Fans attended |
| 25. 9. 2026 | Olympiakos FC"-Atella | 19 399 |
| 24. 9. 2026 | Olympiakos FC"-OFI Thyreum F.C.™ | 13 555 |
| 23. 9. 2026 | Olympiakos FC"-Klagenfurt | 20 385 |
| 23. 9. 2026 | Olympiakos FC"-FC Sydney Gold Coast™ | 20 119 |
| 22. 9. 2026 | Olympiakos FC"-Ermoupoli | 19 292 |
| 22. 9. 2026 | Olympiakos FC"-FC Tirol Innsbruck | 20 498 |
| 22. 9. 2026 | Olympiakos FC"-CFC Hertha 06 Berlin | 19 733 |
| 22. 9. 2026 | Olympiakos FC"-Paris FC | 19 301 |
| 22. 9. 2026 | Olympiakos FC"-Paris FC | 19 695 |