| Date | Home | Away | Group | Result |
|---|---|---|---|---|
| 19/09/23 17:45 | Young Boys Bern | RB Leipzig | Group G | 1-3 |
| 19/09/23 17:45 | AC Milan | Newcastle United | Group F | 0-0 |
| 19/09/23 20:00 | Schachtjor Donezk | FC Porto | Group H | 1-3 |
| 19/09/23 20:00 | FC Barcelona | Royal Antwerp FC | Group H | 5-0 |
| 19/09/23 20:00 | Manchester City | Red Star Belgrad | Group G | 3-1 |
| 19/09/23 20:00 | Paris St. Germain | Borussia Dortmund | Group F | 2-0 |
| 19/09/23 20:00 | Feyenoord Rotterdam | Celtic Glasgow | Group E | 2-0 |
| 19/09/23 20:00 | Lazio Rom | Atletico Madrid | Group E | 1-1 |
| 20/09/23 17:45 | Real Madrid | 1. FC Union Berlin | Group C | 1-0 |
| 20/09/23 17:45 | Galatasaray Istanbul | FC Copenhagen | Group A | 2-2 |
| 20/09/23 20:00 | Real Sociedad | Inter Milan | Group D | 1-1 |
| 20/09/23 20:00 | Benfica Lisbon | FC Red Bull Salzburg | Group D | 0-2 |
| 20/09/23 20:00 | Sporting Braga | SSC Napoli | Group C | 1-2 |
| 20/09/23 20:00 | FC Sevilla | RC Lens | Group B | 1-1 |
| 20/09/23 20:00 | Arsenal FC | PSV Eindhoven | Group B | 4-0 |
| 20/09/23 20:00 | FC Bayern Munich | Manchester United | Group A | 4-3 |