I want to know how Bayern Munich will be without Lewandowski in the Champions League, because we know several seasons Lewandowski has always been a mainstay for Bayern Munich. But now they have to stop Lewandowski from doing anything. With Lewandowski's length at Bayern Munich, they should have understood Lewandowski's movements. But we'll see in the match later.
Lewandowski is a one of best strikers so losing him means a loss for Bayern but Bayern did not let he goes without a good replacement. They had Mane and so far Mane has adapted and played very well in Bayern. He also has good experience in Champions League with Bayern.
The problems with Bayern come from their whole team and old players. They are trying to replace old players by younger ones in past few seasons and the transition is still going. It has yet finished and with any transition, it's unrealistic to require stable performance. Mane can play well but the result will be contributed by other players as well. In general, the quality and performance of Bayern is a bit decreased than their best few seasons ago.