Chelsea were favourites to take all three points away at Leeds United on Sunday.
The Blues were however given a shock 3-0 defeat at Elland Road.
It was a game that Chelsea could easily have been 2-0 up in the first 20 minutes of the game, but the Blues couldn’t convert their chances.
Leeds would go on to punish Chelsea with three goals, starting with a goal from an Edouard Mendy error after the half-hour mark.
Thomas Tuchel has insisted that the game was lost when Chelsea failed to take their chances in the first 20 minutes of the game.
“I think we lost it in the first 20 minutes,” he said.
“We created enough chances and half chances to be 1-0 or 2-0 up and then we lost the discipline, we lost the repetition in doing what we wanted to do and what we did okay in the first 20 minutes.
“For 20 minutes we did it and then we did too much of our own ideas, too much different stuff, which cost us the dominance, cost us the chance to create more chances, but still we did not invite pressure, we did not invite chances, we were not in chaos.
“This is not the story. We were not all over the place, we did not lose our discipline against the ball. With the ball we were not disciplined enough, we were not sharp enough after 20 minutes, but against the ball everything was fine. It was not like we could not cope with anything.
“It’s a set-piece and a huge mistake and until then it should only have been one team and that’s us. There was enough in the first 15 minutes to kill that game, to bring it in the minimum into the direction where it was last season, when we scored the opening chance, did what we did and had a comfortable win. It was possible.
“Instead of 2-0 to us it became an even match, we gave two goals away, two cheap and unnecessary goals. Then the game is almost done because you lift their spirit and their belief.
“In the second half we tried but it was the same story. We have deliveries, we have chances, we have shots but we cannot score and we concede by a half-chance.”