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| 1st(1st leg) | Raków Częstochowa | - | Aris Limassol | 2:1 (1:0) | ||
| 2nd (2nd leg) | Aris Limassol | - | Raków Częstochowa | 0:1 (0:0) | ||
| 1st(1st leg): 08/08/2023 19:00 | 2nd (2nd leg): 15/08/2023 18:00 | Winner: Raków Częstochowa | ||||
| 1st(1st leg) | FC København | - | AC Sparta Praha | 0:0 (0:0) | ||
| 2nd (2nd leg) | AC Sparta Praha | - | FC København | 2:4 (0:1, 1:1, 3:3) pso | ||
| 1st(1st leg): 08/08/2023 19:00 | 2nd (2nd leg): 15/08/2023 18:00 | Winner: FC København | ||||
| 1st(1st leg) | PSV Eindhoven | - | Sturm Graz | 4:1 (3:1) | ||
| 2nd (2nd leg) | Sturm Graz | - | PSV Eindhoven | 1:3 (1:2) | ||
| 1st(1st leg): 08/08/2023 19:30 | 2nd (2nd leg): 15/08/2023 19:30 | Winner: PSV Eindhoven | ||||
| 1st(1st leg) | KÍ Klaksvík | - | Molde FK | 2:1 (0:0) | ||
| 2nd (2nd leg) | Molde FK | - | KÍ Klaksvík | 2:0 (1:0, 1:0) aet | ||
| 1st(1st leg): 08/08/2023 19:45 | 2nd (2nd leg): 15/08/2023 18:00 | Winner: Molde FK | ||||
| 1st(1st leg) | Olimpija Ljubljana | - | Galatasaray | 0:3 (0:1) | ||
| 2nd (2nd leg) | Galatasaray | - | Olimpija Ljubljana | 1:0 (1:0) | ||
| 1st(1st leg): 08/08/2023 20:00 | 2nd (2nd leg): 15/08/2023 19:00 | Winner: Galatasaray | ||||
| 1st(1st leg) | Sporting Braga | - | TSC Bačka Topola | 3:0 (2:0) | ||
| 2nd (2nd leg) | TSC Bačka Topola | - | Sporting Braga | 1:4 (1:4) | ||
| 1st(1st leg): 08/08/2023 20:00 | 2nd (2nd leg): 15/08/2023 19:00 | Winner: Sporting Braga | ||||
| 1st(1st leg) | Panathinaikos | - | Olympique Marseille | 1:0 (0:0) | ||
| 2nd (2nd leg) | Olympique Marseille | - | Panathinaikos | 3:5 (2:0, 2:1, 2:1) pso | ||
| 1st(1st leg): 09/08/2023 19:00 | 2nd (2nd leg): 15/08/2023 20:00 | Winner: Panathinaikos | ||||
| 1st(1st leg) | Slovan Bratislava | - | Maccabi Haifa | 1:2 (1:2) | ||
| 2nd (2nd leg) | Maccabi Haifa | - | Slovan Bratislava | 3:1 (2:0) | ||
| 1st(1st leg): 09/08/2023 19:30 | 2nd (2nd leg): 15/08/2023 18:00 | Winner: Maccabi Haifa | ||||
| 1st(1st leg) | Rangers FC | - | Servette FC | 2:1 (2:1) | ||
| 2nd (2nd leg) | Servette FC | - | Rangers FC | 1:1 (1:0) | ||
| 1st(1st leg): 09/08/2023 19:45 | 2nd (2nd leg): 15/08/2023 19:30 | Winner: Rangers FC | ||||
| 1st(1st leg) | Dinamo Zagreb | - | AEK Athen | 1:2 (1:0) | ||
| 2nd (2nd leg) | AEK Athen | - | Dinamo Zagreb | 2:2 (0:1) | ||
| 1st(1st leg): 15/08/2023 19:00 | 2nd (2nd leg): 19/08/2023 19:45 | Winner: AEK Athen | ||||
