Tuchel conceded he regrets his starting XI for the 1-0 loss.
"I think we lacked a little bit of freshness today. (N'Golo) Kante has been ill for some days and I decided to let him start," he said.
"Jorginho has had some problems and Thiago could not start, so maybe today it is on me for not making the best choices in that sense. We decided on 3-5-2 but I don't think it's a matter of structure against City, it's about decisions and adapting to the opponent's spaces.
"We win together and we lose together but I will ask the questions of myself of whether it was the right shape but I'm not sure the shape was decisive in the result."
Tuchel also refused to consider criticism of Romelu Lukaku on the day.
He added: "I don't think it's necessary to talk about Romelu's struggles today. When we reached him, the attack was already half over because there were not enough people and there was simply no belief and connection. It was a team problem rather than an individual problem."
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