Tuchel, taking charge for the first time since replacing Jurgen Klopp at the helm, saw his side register a 5-0 friendly win against amateur side Rhede on Friday.
Although a friendly against lesser opposition, Tuchel was pleased with a positive start to life in charge of Dortmund, just four days after linking up with his new club.
“I’ve met a very open team here,” he told Sport1 television. “The team embodies a high level of concentration.
“We’re feeling very good here.”
Ilkay Gundogan, fresh from committing to a new contract with the club, opened the scoring for Dortmund, who are already in Europa League action later on this month.
Henrikh Mkhitaryan added a second before three members of Dortmund’s reserves completed the scoring as Tuchel fielded two different sides in each half.