With the departure of Lewandoski, many expect Bayern bring in a proper no. 9. Although Mane isn’t a like-for-like option but I am convinced that he is going to score many goals and almost replace Lewandoski. He might be deployed as a speedy target man, something similar to Jamie Vardy at Leicester City and Kylian Mbappé at PSG. Mane has proven that he can score from all over the pitch, with his decisiveness in front of goal from wherever he operates. So I strongly believe that he can excel as a no. 9, and there is little or no doubt that he'd be great at the job in Lewandoski’s absence.
Next season Bayern already have Sadio Mane as a new player who was brought in this summer, Sadio Mane and Thomas Muller can certainly trouble the opponent's defense. I saw when Sadio Mane was at Liverpool he was an active player providing assists and scoring goals. finishing very well and often a goal. Moreover, in the Bundesliga, the competition is not as tight as the Premier League, which is why he can score more goals next season, maybe I will think Sadio Mane can score 20 goals in his first season with Bayern Munich.