Tuchel will leave at the end of the season.
Dier, who has signed permanently from Tottenham, told Kicker: The results weren't right, then came the announcement of Thomas Tuchel's departure in the summer. If he has to leave and I'm his player, I should feel at least some responsibility."
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Dier also spoke about potential parallels between the Bundesliga and the Premier League.
When I look at the leagues, Germany and England are very similar. The atmosphere is different, but always great. The stadiums are full, people are excited about football. In any case, I love being here at this club," he says.
He adds: I totally identify with the values, the culture and the philosophy of this club. I think I fit in very well here. I feel incredibly comfortable."