Bayern first games generally end by a big victory but that doesn't mean that they sometimes miss it up. They will have Mane in the attack line, probably replacing Lewandowski. For Frankfurt, they will try to grab Mario Gotze among the other transfers. This game particularly might be challenging so let's wait until we get a better view on both teams days before the match.
Bayern Munich have announce with success agreement transfer with Liverpool for Sadio Mane sign in but I don't think he will replace position leaving by Lewandowski. Have different typical games play between Mane and Lewandowski, trough with several years with Liverpool, Sadio Mane actually active play on left winger and not have central forward position. Lewandowski as central forward and he can't play as winger and I think after Sadio Mane arrived on Bayern Munich still have another option with new central forward, if Lewandowski agree leaving Bayern Munich in this season.