| Date | Home | Away | Group | Result |
|---|---|---|---|---|
| 21/09/23 17:45 | Bayer 04 Leverkusen | BK Häcken | Group H | 4-0 |
| 21/09/23 17:45 | Qarabag | Molde FK | Group H | 1-0 |
| 21/09/23 17:45 | Sheriff Tiraspol | AS Roma | Group G | 1-2 |
| 21/09/23 17:45 | Servette FC Genève | Slavia Prag | Group G | 0-2 |
| 21/09/23 17:45 | Linzer ASK | Liverpool FC | Group E | 1-3 |
| 21/09/23 17:45 | Stade Rennes | Maccabi Haifa | Group F | 3-0 |
| 21/09/23 17:45 | Panathinaikos Athens | FC Villarreal | Group F | 2-0 |
| 21/09/23 17:55 | Royale Union Saint-Gilloise | FC Toulouse | Group E | 1-1 |
| 21/09/23 20:00 | West Ham United | TSC Backa Topola | Group A | 3-1 |
| 21/09/23 20:00 | Olympiakos Piräus | SC Freiburg | Group A | 2-3 |
| 21/09/23 20:00 | Ajax Amsterdam | Olympique Marseille | Group B | 3-3 |
| 21/09/23 20:00 | Brighton and Hove Albion | AEK Athens | Group B | 2-3 |
| 21/09/23 20:00 | Sparta Prag | Aris Limassol | Group C | 3-2 |
| 21/09/23 20:00 | Glasgow Rangers | Real Betis Sevilla | Group C | 1-0 |
| 21/09/23 20:00 | Atalanta Bergamo | KS Rakow Czestochowa | Group D | 2-0 |
| 21/09/23 20:00 | SK Sturm Graz | Sporting Lisbon | Group D | 1-2 |