| Date | Home | Away | Group | Result |
|---|---|---|---|---|
| 9/19/23 11:45 AM | Young Boys Bern | RB Leipzig | Group G | 1-3 |
| 9/19/23 11:45 AM | AC Milan | Newcastle United | Group F | 0-0 |
| 9/19/23 2:00 PM | Schachtjor Donezk | FC Porto | Group H | 1-3 |
| 9/19/23 2:00 PM | FC Barcelona | Royal Antwerp FC | Group H | 5-0 |
| 9/19/23 2:00 PM | Manchester City | Red Star Belgrad | Group G | 3-1 |
| 9/19/23 2:00 PM | Paris St. Germain | Borussia Dortmund | Group F | 2-0 |
| 9/19/23 2:00 PM | Feyenoord Rotterdam | Celtic Glasgow | Group E | 2-0 |
| 9/19/23 2:00 PM | Lazio Rom | Atletico Madrid | Group E | 1-1 |
| 9/20/23 11:45 AM | Real Madrid | 1. FC Union Berlin | Group C | 1-0 |
| 9/20/23 11:45 AM | Galatasaray Istanbul | FC Copenhagen | Group A | 2-2 |
| 9/20/23 2:00 PM | Real Sociedad | Inter Milan | Group D | 1-1 |
| 9/20/23 2:00 PM | Benfica Lisbon | FC Red Bull Salzburg | Group D | 0-2 |
| 9/20/23 2:00 PM | Sporting Braga | SSC Napoli | Group C | 1-2 |
| 9/20/23 2:00 PM | FC Sevilla | RC Lens | Group B | 1-1 |
| 9/20/23 2:00 PM | Arsenal FC | PSV Eindhoven | Group B | 4-0 |
| 9/20/23 2:00 PM | FC Bayern Munich | Manchester United | Group A | 4-3 |