*Racing Genk 2-2 Adana Demirspor
| 31.08.2023 | Adana Demirspor | 1-0/p.4-5 | Racing Genk | |
| 24.08.2023 | Racing Genk | 2-1 | Adana Demirspor | |
Hibernian FC 0-8 Aston Villa *
| 31.08.2023 | Aston Villa | 3-0 | Hibernian FC | |
| 23.08.2023 | Hibernian FC | 0-5 | Aston Villa | |
*AZ Alkmaar 4-4 SK Brann
| 31.08.2023 | SK Brann | 3-3/p.5-6 | AZ Alkmaar | |
| 24.08.2023 | AZ Alkmaar | 1-1 | SK Brann | |
CA Osasuna 3-4 Club Brugge *
| 31.08.2023 | Club Brugge | 2-2 | CA Osasuna | |
| 24.08.2023 | CA Osasuna | 1-2 | Club Brugge | |
Dynamo Kyiv 2-4 Besiktas JK *
| 31.08.2023 | Besiktas JK | 1-0 | Dynamo Kyiv | |
| 24.08.2023 | Dynamo Kyiv | 2-3 | Besiktas JK | |
FC Midtjylland 4-4 Legia Warszawa *
| 31.08.2023 | Legia Warszawa | 1-1/p.6-5 | FC Midtjylland | |
| 24.08.2023 | FC Midtjylland | 3-3 | Legia Warszawa | |
*FC Nordsjælland 6-0 FK Partizan
| 31.08.2023 | FK Partizan | 0-1 | FC Nordsjælland | |
| 24.08.2023 | FC Nordsjælland | 5-0 | FK Partizan | |
*Fenerbahçe SK 6-1 FC Twente
| 31.08.2023 | FC Twente | 0-1 | Fenerbahçe SK | |
| 24.08.2023 | Fenerbahçe SK | 5-1 | FC Twente | |
Sepsi OSK 4-5 FK Bodo/Glimt *
| 31.08.2023 | FK Bodo/Glimt | 3-2 AET | Sepsi OSK | |
| 24.08.2023 | Sepsi OSK | 2-2 | FK Bodo/Glimt | |
*Lille OSC 3-2 HNK Rijeka
| 31.08.2023 | HNK Rijeka | 1-1 AET | Lille OSC | |
| 24.08.2023 | Lille OSC | 2-1 | HNK Rijeka | |
Levski Sofia 1-3 Eintracht Frankfurt *
| 31.08.2023 | Eintracht Frankfurt | 2-0 | Levski Sofia | |
| 24.08.2023 | Levski Sofia | 1-1 | Eintracht Frankfurt | |
*Maccabi Tel Aviv 5-2 Celje
| 31.08.2023 | Celje | 1-1 | Maccabi Tel Aviv | |
| 24.08.2023 | Maccabi Tel Aviv | 4-1 | Celje | |
Hearts FC 1-6 PAOK Salonica *
| 31.08.2023 | PAOK Salonica | 4-0 | Hearts FC | |
| 24.08.2023 | Hearts FC | 1-2 | PAOK Salonica | |
Rapid Wien 1-2 Fiorentina *
| 31.08.2023 | Fiorentina | 2-0 | Rapid Wien | |
| 24.08.2023 | Rapid Wien | 1-0 | Fiorentina | |
*Spartak Trnava 3-2 SK Dnipro-1
| 31.08.2023 | SK Dnipro-1 | 1-2 AET | Spartak Trnava | |
| 23.08.2023 | Spartak Trnava | 1-1 | SK Dnipro-1 | |
Tobol Kostanay 1-5 Viktoria Plzen *
| 31.08.2023 | Viktoria Plzen | 3-0 | Tobol Kostanay | |
| 24.08.2023 | Tobol Kostanay | 1-2 | Viktoria Plzen | |