Champions League[]
The labels in the parentheses show how each team qualified for the place of its starting round:
- TH: Champions League title holders
- EL: Europa League title holders
- 1st, 2nd, 3rd, 4th, etc.: League positions of the previous season
- Abd-: League positions of abandoned season due to the COVID-19 pandemic in Europe as determined by the national association; all teams were subject to approval by UEFA as per the guidelines for entry to European competitions in response to the COVID-19 pandemic.
Europa League[]
The labels in the parentheses show how each team qualified for the place of its starting round:
- 1st, 2nd, 3rd, 4th, etc.: League positions of the previous season
- Abd-: League positions of abandoned season due to the COVID-19 pandemic in Europe as determined by the national association; all teams were subject to approval by UEFA as per the guidelines for entry to European competitions in response to the COVID-19 pandemic.