City won via Kevin de Bruyne's winner on 70 minutes.
Tuchel later said: "Given the circumstances, if you look at our back five and how many players we missed, I'm happy with the performance, defensive-wise.
"In the second half we created counter chances. We had one big chance to even go ahead. We lost a tight match, which can happen. It was about individual quality, and we lacked quality up front if I'm honest.
"You have to wait for momentum. We had the same opportunities in the first half, but from eight or nine transition options we had zero touches in the box. The quality, the deliveries and the composure was absolutely not on top level today. You need top level to get half chances and chances, and that's what we lacked in the first half.
"Our offensive players need to show up more. We need consistency. Chelsea is not a place to hide."
On the title race, he added: "It's about commitment. We can be sure that we're trying. If City win 12 matches in a row and we're struggling with injuries and Covid, it's not the best time to close the gap. The gap is big because they deal better with Covid and better with injuries."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!