Atlético Madrid v FC Porto, 15 September 2021
| Score | 0-0 |
| Referee | Ovidiu Haţegan |
| Competition | UEFA Champions League Group B |
| Venue | Wanda Metropolitano, Madrid |
| Attendance | 40,098 |
Kick-off: 9.00pm local
0 Atlético Madrid
Manager: Diego Simeone
0 FC Porto
Manager: Sérgio Conceição