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Bayern returned to top form just in time for their trip to Spain, as they thrashed VfB Stuttgart 4-0, with Harry Kane scoring three goals.
An astonishing 24 goals in their first seven Bundesliga games showed the Bavarians' strength. In Europe, Bayern had a resounding 9-2 win over Dinamo Zagreb in their opening game, but then lost 0-1 to Aston Villa.
Bayern will be confident of making the trip to Spain as key midfielder Jamal Musiala has recovered from injury. However, Aleksandar Pavlovic is a definite absentee after breaking his collarbone in the win over Stuttgart. That will give summer signing Joao Palhinha a chance to impress in the holding midfield role.
Former Bayern coach Flick's tenure at Barcelona has started well, winning 10 of 12 games. They have lost just twice, against AS Monaco in the Champions League and 2-4 against Osasuna in LaLiga.
Former Bayern Munich striker Lewandowski also appears to be back to his best, with 12 goals in 10 LaLiga games so far and a brace in the 5-0 win over Young Boys in the second leg of the Champions League.
Except for the injury of number 1 goalkeeper Marc-Andre ter Stegen, Barca will have almost the strongest squad to face Bayern. Notably, midfielder Gavi has returned to play.
Match statistics
Thomas Muller has eight goals and two assists in nine Champions League appearances against Barca. No other player who has never played in Spain has scored as many goals against the Catalans.
Bayern have won 11 of their 15 meetings with Barcelona in this competition, losing just twice.
Barcelona have not won any of their last seven meetings with Bayern, losing six. Of these, the Catalans have lost all three of their last home games against Bayern.
Bayern have lost just five of their last 36 away games in the Champions League, although they have been beaten in their last two.
Former Bayern Munich head coach Flick boasts the best win percentage (81.9%) of any Bayern coach in history, winning seven trophies in his 19-month tenure. He led Bayern to a sextuple in 2020, including an 8-2 thrashing of Barca in the Champions League quarter-finals.
Lewandowski is second on Bayern's all-time scoring list with 344 goals. He has yet to score in his two appearances for Barcelona against his former club.
Lewandowski is one of eight players to have played for both of Europe's major clubs, the others including: Thiago Alcantara, Arturo Vidal, Pepe Reina, Philippe Coutinho, Mark van Bommel, Joao Cancelo and Patrik Andersson.
The Barcelona - Bayern Munich match takes place at 2:00 a.m. on October 24.