The Blues ended up losing 3-0 to the Whites at Elland Road.
They started the game strongly but missed opportunities to score before goalkeeper Edouard Mendy gifted Jesse Marsch’s side the lead.
Chelsea went in a half-time 1-0 down before conceding goals after the interval to Rodrigo and Jack Harrison.
To make matters worse, summer signing Kalidou Koulibaly was sent off eight minutes before time meaning he will now have to serve a suspension.
Speaking on BBC Five Live after the match, Tuchel said: “We could have closed the game down in first 20 minutes. After that it was an even game, then we gave two gifts away. What do you expect if you present two goals to an opponent in the Premier League.
“We give goals away from huge individual errors too often. It is what it is. This is the squad. My energy goes to the squad we have, we try to make the squad better, but if we don’t we fight what we have.
He added: “It is the transfer period and things are always crazy. We didn’t see it coming. We got frustrated because we had a good start, created huge chances, but we got frustrated.
“We conceded the first goal and then after the second one almost lost the match there and then.”
Chelsea began this new season with a 1-0 away win at Everton but have failed to win in their last two games now.
They drew 2-2 with Tottenham Hotspur last weekend and have now been left disappointed following their drubbing at Leeds.
Tuchel wants his side to stop gifting soft goals away and they are already falling behind rivals in the Premier League table.
The London club are back in action next Saturday at home to Leicester City at Stamford Bridge. The Foxes are in poor form and are yet to win this term under Brendan Rodgers.