StadiumStadion Rex Karlštejn
| Current capacity of the stadium |
| Standing | 44 100 |
| Seats | 27 500 |
| Tribune | 16 500 |
| Seats for sponsors | 600 |
| Fans attended |
| 31. 7. 2021 | Rex Karlštejn-Colwyn Bay | 19 834 |
| 28. 7. 2021 | Rex Karlštejn-FK Demjata | 27 258 |
| 21. 7. 2021 | Rex Karlštejn-Dortmund | 20 364 |
| 14. 7. 2021 | Rex Karlštejn-PSV Eindhoven A | 27 572 |
| 7. 7. 2021 | Rex Karlštejn-Omiš | 27 320 |
| 30. 6. 2021 | Rex Karlštejn-FCB El Tigre 1922 | 19 919 |
| 23. 6. 2021 | Rex Karlštejn-Fc Sihoť Trenčín™ | 28 360 |
| 19. 6. 2021 | Rex Karlštejn-Lasswade | 28 173 |
| 12. 6. 2021 | Rex Karlštejn-FC Sigma Hranice | 26 004 |