Having joined BVB on a three-year deal in summer 2015, Tuchel and the club put back talks about a new deal until the summer.
Bayern lost to Real Madrid in the Champions League quarterfinals last week and crashed out of the DFB Pokal to Borussia Dortmund in the semifinals.
Dortmund's German Cup semifinal win over Bayern involved character and a lot of luck. It also gave a true sense of the Bavarians' flaws.
Berlin is prepared for a busy DFB Pokal cup final weekend with former U.S. president Barack Obama making one of his first public appearances.
Bayern Munich's treble hopes have disappeared in eight days as they once again look brittle towards the business end of the season.
Borussia Dortmund manager Thomas Tuchel feels they can win the DFB Pokal after beating Bayern Munich 3-2.