Sane, Gnabry and Leon Goretzka are three players Bayern Munich prefers to put them for sale because they couldn't have had good performances recently in this team.
I don't think Bayern Munich played too badly with Tuchel. Bayern Munich have lost points in 5 matches so far this season (2 draws, 3 losses). Last season, Bayern Munich lost points in a total of 8 matches (8 draws, 5 losses). Bayern Munich's performance remains the same. But the defeat against a team like Lazio in the Champions League was completely unexpected. However, the team still has the ability to qualify for the next round. If they play well in the second leg match, Munich can secure the ticket to the quarter finals.
Barcelona coach Xavi is not interested in extending his contract with Barcelona. We will probably see Tuchel as the coach of Barcelona in the future. Tuchel's chances of staying with Munich are very low if they don't win the Champions League this year.