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| 1st(1st leg) | Slavia Praha | - | Zorya Lugansk | 2:0 (0:0) | ||
| 2nd (2nd leg) | Zorya Lugansk | - | Slavia Praha | 2:1 (2:0) | ||
| 1st(1st leg): 24/08/2023 18:00 | 2nd (2nd leg): 31/08/2023 18:00 | Winner: Slavia Praha | ||||
| 1st(1st leg) | BK Häcken | - | Aberdeen FC | 2:2 (1:0) | ||
| 2nd (2nd leg) | Aberdeen FC | - | BK Häcken | 1:3 (0:2) | ||
| 1st(1st leg): 24/08/2023 18:00 | 2nd (2nd leg): 31/08/2023 19:45 | Winner: BK Häcken | ||||
| 1st(1st leg) | PFC Ludogorets Razgrad | - | AFC Ajax | 1:4 (0:3) | ||
| 2nd (2nd leg) | AFC Ajax | - | PFC Ludogorets Razgrad | 0:1 (0:0) | ||
| 1st(1st leg): 24/08/2023 19:00 | 2nd (2nd leg): 31/08/2023 19:00 | Winner: AFC Ajax | ||||
| 1st(1st leg) | Olimpija Ljubljana | - | Qarabağ FK | 0:2 (0:2) | ||
| 2nd (2nd leg) | Qarabağ FK | - | Olimpija Ljubljana | 1:1 (1:1) | ||
| 1st(1st leg): 24/08/2023 19:00 | 2nd (2nd leg): 31/08/2023 17:00 | Winner: Qarabağ FK | ||||
| 1st(1st leg) | Dinamo Zagreb | - | AC Sparta Praha | 3:1 (1:1) | ||
| 2nd (2nd leg) | AC Sparta Praha | - | Dinamo Zagreb | 4:1 (2:0) | ||
| 1st(1st leg): 24/08/2023 19:00 | 2nd (2nd leg): 31/08/2023 18:00 | Winner: AC Sparta Praha | ||||
| 1st(1st leg) | Union Saint-Gilloise | - | FC Lugano | 2:0 (1:0) | ||
| 2nd (2nd leg) | FC Lugano | - | Union Saint-Gilloise | 0:1 (0:1) | ||
| 1st(1st leg): 24/08/2023 19:30 | 2nd (2nd leg): 31/08/2023 19:30 | Winner: Union Saint-Gilloise | ||||
| 1st(1st leg) | Slovan Bratislava | - | Aris Limassol | 2:1 (1:0) | ||
| 2nd (2nd leg) | Aris Limassol | - | Slovan Bratislava | 6:2 (3:1) | ||
| 1st(1st leg): 24/08/2023 19:30 | 2nd (2nd leg): 31/08/2023 18:00 | Winner: Aris Limassol | ||||
| 1st(1st leg) | KÍ Klaksvík | - | FC Sheriff | 1:1 (0:0) | ||
| 2nd (2nd leg) | FC Sheriff | - | KÍ Klaksvík | 2:1 (1:1) | ||
| 1st(1st leg): 24/08/2023 19:45 | 2nd (2nd leg): 31/08/2023 18:00 | Winner: FC Sheriff | ||||
| 1st(1st leg) | Olympiakos Piraeus | - | FK Čukarički | 3:1 (3:0) | ||
| 2nd (2nd leg) | FK Čukarički | - | Olympiakos Piraeus | 0:3 (0:2) | ||
| 1st(1st leg): 24/08/2023 20:00 | 2nd (2nd leg): 31/08/2023 19:00 | Winner: Olympiakos Piraeus | ||||
| 1st(1st leg) | LASK | - | Zrinjski Mostar | 2:1 (2:0) | ||
| 2nd (2nd leg) | Zrinjski Mostar | - | LASK | 1:1 (1:0) | ||
| 1st(1st leg): 24/08/2023 20:00 | 2nd (2nd leg): 31/08/2023 20:00 | Winner: LASK | ||||
