Lewandowski professionalism is unquestionable, before moving to Bayern Munich he had played with Dortmund. Lewandowski has repeatedly scored against Dortmund while still defending Bayern Munich, the same condition will be done by Lewandowski when he meets his former club (Bayern Munich) in the UCL Group stage. Now that Lewandowski's job is to score against Munich, the match against Bayern Munich was very emotional for Lewandowski, maybe he won't celebrate after scoring against Munich out of respect for his former club.
the match between bayern and barcelona will be a reunion match between lewandowski and bayer munich and also he will meet old friends as opponents in this fight. we can see the quality of xavi squad in this match where after making a major overhaul in this summer's window Barcelona is like a team that is very fierce when facing its opponents. if we look at the statistics of their meetings where the match between bayern and barcelona always ends with a big score and I think this trend will continue in the upcoming matches.