[3] The stadium was originally appointed to host the 2020 UEFA Champions League final, but both this and the 2021 editions, which had been subsequently re-allocated to the Atatürk, were moved due to the COVID-19 pandemic.

Having earlier won the Premier league and FA Cup titles, they achieved a continental treble.

[4][5] As winners, Manchester City earned the right to play against Sevilla, the winners of the 2022–23 UEFA Europa League, in the 2023 UEFA Super Cup, as well as qualifying for both the 2023 and 2025 FIFA Club World Cups in Saudi Arabia and the United States, respectively.

A total of 78 teams from 53 of the 55 UEFA member associations participated in the 2022–23 UEFA Champions League (the exceptions being Russia, who were banned from participating due to the Russian invasion of Ukraine, and Liechtenstein,[Note LIE] which did not organise a domestic league).

[8] Due to the suspension of Russia for the 2022–23 European season, the following changes to the access list were made:[9] Since the Champions League title holders (Real Madrid) qualified via their domestic league, the following changes to the access list were made:[9] The labels in the parentheses show how each team qualified for the place of its starting round: The second qualifying round, third qualifying round and play-off round were divided into Champions Path (CH) and League Path (LP).

The draws for the qualifying round started at 12:00 CEST/CET and were held at the UEFA headquarters in Nyon, Switzerland.

The matches took place at Víkingsvöllur in Reykjavík, Iceland so the first team drawn in each tie in the semi-final round, and also the final round (between the two winners of the semi-finals, whose identity was not known at the time of draw), would be the "home" team for administrative purposes.

The losers of the semi-finals and final were transferred to the Europa Conference League Champions Path second qualifying round.

The losers were transferred to the Europa Conference League Champions Path second qualifying round.

Eintracht Frankfurt made their debut appearance in the group stage (and first appearance in the European Cup since their loss in the 1960 final) after winning the 2021–22 UEFA Europa League and, as a result, this was the first time that five German clubs played in the group stage.

In the knockout phase, teams played against each other over two legs on a home-and-away basis, except for the one-match final.