The same kind of problems carried over from last season’s failed campaign to the one that started badly in Switzerland, errors in defense plus lapses of discipline leading to an ill-timed red card.
The Bundesliga giants handed Barcelona a brutal demonstration of how far their opponents have fallen as Mueller scored the opening goal at the Camp Nou before Robert Lewandowski netted twice.
The Italian side returns to the Champions League after a seven-year absence.
Real Madrid, Barcelona and Juventus will play in this Champions League while still fighting tournament organizer UEFA in court for the right to organize a rival competition.
The low-ranked club from Tiraspol in the breakaway region of Transnistria had to get through all four qualifying rounds to reach the groups.
The Dragao Stadium, in the Portuguese city of Porto, will host on May 29 the final of the Champions League.
Stadiums have been closed to spectators in Portugal but pandemic restrictions are being eased to allow them to be at 10% capacity for the final round of league games next Wednesday.
Chelsea were one of the 12 clubs to sign up to the ESL project, which would have put an even greater strain on players, with a minimum of 18 regular-season games for all the clubs involved.
The new format -- which will see all 36 clubs brought together into one pool instead of the current system of four-team groups -- was approved at an executive committee meeting.
A referee's assistant had asked Erling Haaland to sign red and yellow cards after Borussia Dortmund's Champions League game at Manchester City.
Guardiola said the club is open to the possibility of changing that approach but does not believe it would be a game-changer for City, which has never won the Champions League.
From his position out wide, Alexander-Arnold has been the most creative player on a team that has conquered Europe and, finally after 30 years, the English game over the past couple of years.
The incident at City's Etihad Stadium was featured heavily on social media.
With one eye on a potential semi-final, Ribery, Robert Lewandowski, Jerome Boateng and Joshua Kimmich must tread carefully as they are a booking away from a ban.
Bale was a surprise inclusion ahead of Karim Benzema at the Santiago Bernabeu, where Real held a 3-0 advantage from the opening match in Turin.