Bayern Munich boss Thomas Tuchel knows it will not be easy to ‘flip the switch’ and get their Bundesliga campaign back on track.

Tuchel faced more questions over the direction of his side following the 1-0 home loss to Werder Bremen on Sunday, which left Bayern seven points behind unbeaten leaders Bayer Leverkusen, who have played one match more.

Union Berlin head to the Allianz Arena for Wednesday night’s rearranged game – with Bayern fans demanding an immediate response.

“It is not a case of simply flipping a switch. It is not easy,” Tuchel told a press conference.

“We are very aware of the state of play. It is our job and my responsibility to influence it. We are actually very positive, but we are falling well short of our expectations in matches.

“We will continue to demand it until it works, and we are ready to show the desire that will also spark the fans – we are below our expectations.

“We can do a lot better. There is a lot of room for improvement. The explanation in terms of passion, bite, tackling and enthusiasm remains the same.

“It is the foundation for all tactical things. We have not shown that and we will try to do so tomorrow.”

Tuchel maintains he is not feeling any extra pressure from the Bayern boardroom.

“I also have a very good relationship with (chief executive) Jan-Christian Dreesen. There have been no concrete exchanges,” Tuchel said.

“Christoph Freund is with us every day as sporting director. He has expressed his opinion – and he is right to do so.”

Tuchel reported no fresh injury concerns, but remains without defenders Kim Min-Jae and Noussair Mazraoui, who are on international duty.

Union Berlin head coach Nenad Bjelica is expecting Bayern to come out “with anger in their stomachs”, but challenged his side to make the most of their own opportunities.

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“Bayern are one of the most difficult opponents you can face in the Bundesliga, but like Werder Bremen, we are hoping to take our chances and capitalise on them to come home with one or more points,” Bjelica said at a press conference.

“Munich will certainly go into the game with anger in their stomachs, which is why we want to go into the clash with maximum discipline, aggression and courage.”

Union Berlin, whose last match against Mainz was postponed because of freezing conditions, have strengthened the squad with the signing of forward Chris Bedia from Swiss club Servette.

Rani Khedira and Josip Juranovic remain unavailable because of injury, while Aissa Laidouni is away at the Africa Cup of Nations.