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| 1st(1st leg) | Royal Antwerp FC | - | AEK Athen | 1:0 (1:0) | ||
| 2nd (2nd leg) | AEK Athen | - | Royal Antwerp FC | 1:2 (0:0) | ||
| 1st(1st leg): 22/08/2023 20:00 | 2nd (2nd leg): 30/08/2023 20:00 | Winner: Royal Antwerp FC | ||||
| 1st(1st leg) | Raków Częstochowa | - | FC København | 0:1 (0:1) | ||
| 2nd (2nd leg) | FC København | - | Raków Częstochowa | 1:1 (1:0) | ||
| 1st(1st leg): 22/08/2023 20:00 | 2nd (2nd leg): 30/08/2023 20:00 | Winner: FC København | ||||
| 1st(1st leg) | Rangers FC | - | PSV Eindhoven | 2:2 (1:0) | ||
| 2nd (2nd leg) | PSV Eindhoven | - | Rangers FC | 5:1 (1:0) | ||
| 1st(1st leg): 22/08/2023 20:00 | 2nd (2nd leg): 30/08/2023 20:00 | Winner: PSV Eindhoven | ||||
| 1st(1st leg) | Maccabi Haifa | - | BSC Young Boys | 0:0 (0:0) | ||
| 2nd (2nd leg) | BSC Young Boys | - | Maccabi Haifa | 3:0 (2:0) | ||
| 1st(1st leg): 23/08/2023 20:00 | 2nd (2nd leg): 29/08/2023 20:00 | Winner: BSC Young Boys | ||||
| 1st(1st leg) | Molde FK | - | Galatasaray | 2:3 (1:2) | ||
| 2nd (2nd leg) | Galatasaray | - | Molde FK | 2:1 (1:0) | ||
| 1st(1st leg): 23/08/2023 20:00 | 2nd (2nd leg): 29/08/2023 20:00 | Winner: Galatasaray | ||||
| 1st(1st leg) | Sporting Braga | - | Panathinaikos | 2:1 (0:0) | ||
| 2nd (2nd leg) | Panathinaikos | - | Sporting Braga | 0:1 (0:0) | ||
| 1st(1st leg): 23/08/2023 20:00 | 2nd (2nd leg): 29/08/2023 20:00 | Winner: Sporting Braga | ||||
