Pep Guardiola will be reunited with Lionel Messi – with whom he won two Champions League titles – after Manchester City were drawn to play Paris Saint-Germain in this season’s group stage.
The European giants are joined in Group A by RB Leipzig and Belgian champions Club Brugge.
Chelsea – who beat Manchester City in last season’s final to lift their second Champions League trophy – will play Italian team Juventus, as well as Russian champions Zenit and Swedish champions Malmo.
Liverpool have been drawn into a tough Group B, where they will take on three-time runners-up Atletico Madrid, seven-time winners AC Milan and two-time winners Porto.
Manchester United will face a rematch with Villarreal, who beat them on penalties in the final of last season’s Europa League. Also in Group F are Atalanta and Swiss champions Young Boys.
Bayern Munich and Barcelona – who have won 11 Champions Leagues between them – headline Group E. Barcelona will be competing in the competition without Messi for the first time in 17 years.
Real Madrid – who have won the competition a record 13 times – will take on Italian champions, as well as Shakhtar Donetsk and Sheriff Tiraspol, who are the first Moldovan side to compete in the Champions League.
Group C contains Portuguese champions Sporting, Borussia Dortmund, four-time Champions League winners Ajax and Besiktas.
In Group G, French title-winners Lille face Sevilla, Austrian champions Red Bull Salzburg and Wolfsburg.