Dortmund won 3-0 with Aubameyang opening the scoring before a Marco Reus double.
The 26-year-old now has 30 goals in 34 games this season and has been linked with Manchester United and Arsenal.
But Tuchel says he's going nowhere.
"Everybody has to accept he has a long-term contract without the possibility to step out," Tuchel said.
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Pierre-Emerick Aubameyang is going nowhere says Thomas Tuchel
"I can imagine a lot of clubs see his performance, his talent and his personality and imagine Auba plays for them.
"But we have our own goals. We want to keep this squad together and develop into something extraordinary. We want to have players that lift our status.
"It is not our goal to give him away. I cannot see the future but if you ask me as a coach, I'm very happy he has a long-term contract."
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