| Date | Home | Away | Group | Result |
|---|---|---|---|---|
| 9/20/23 9:30 AM | OSC Lille | Olimpija Ljubljana | Group A | 2-0 |
| 9/21/23 11:45 AM | Ferencvaros Budapest | FK Čukarički | Group F | 3-1 |
| 9/21/23 11:45 AM | KRC Genk | Fiorentina | Group F | 2-2 |
| 9/21/23 11:45 AM | Fenerbahce Istanbul | FC Nordsjaelland | Group H | 3-1 |
| 9/21/23 11:45 AM | PFC Ludogorets Razgrad | Spartak Trnava | Group H | 4-0 |
| 9/21/23 11:45 AM | Eintracht Frankfurt | FC Aberdeen | Group G | 2-1 |
| 9/21/23 11:45 AM | HJK Helsinki | PAOK Saloniki | Group G | 2-3 |
| 9/21/23 11:45 AM | Legia Warschau | Aston Villa | Group E | 3-2 |
| 9/21/23 11:45 AM | HŠK Zrinjski Mostar | AZ Alkmaar | Group E | 4-3 |
| 9/21/23 2:00 PM | Club Brugge | Besiktas Istanbul | Group D | 1-1 |
| 9/21/23 2:00 PM | FC Lugano | FK Bodö/Glimt | Group D | 0-0 |
| 9/21/23 2:00 PM | Dinamo Zagreb | FK Astana | Group C | 5-1 |
| 9/21/23 2:00 PM | Viktoria Plzen | KF Ballkani Suhareka | Group C | 1-0 |
| 9/21/23 2:00 PM | Maccabi Tel Aviv | Breidablik Kopavogur | Group B | 3-2 |
| 9/21/23 2:00 PM | FC Zorya Lugansk | KAA Gent | Group B | 1-1 |
| 9/21/23 2:00 PM | SK Slovan Bratislava | KÍ Klaksvík | Group A | 2-1 |