The German made the decision to swap goalkeeper Edouard Mendy for Kepa Arrizabalaga as the game went to penalties.
Kepa ended up missing a penalty as Liverpool took out the shootout 11-10.
“Football can be a brilliant game and it was a brilliant game, no worries and no regrets,” Tuchel said.
“We gave everything and it was a brilliant match of football. The disallowed goal for Romelu is a very close call – there are bad feelings about this call.
“You need a bit of luck, we scored three times, had big chances, they had big chances, It was a fair result all the way to have a draw.
“We did it before with Kepa, he is slightly better in penalty saving and that is why I made the decision. It is unusual all 11 players need to shoot, he took it a bit too quick. Sometimes these things can turn against you but you make them when they need to be made, not after when people can judge you.
“In the middle of the storm it is pretty calm. We can allow ourselves to focus on what we love the most, playing football. We know there are bigger things than football going on.”
On whether anything will change at the club with yesterday’s ownership statement: “Very confident on a daily basis and how we handle things will not change.”