Antonio Conte felt Juventus had “dominated” the game with Fiorentina apart from “10 nightmare minutes.”
The Bianconeri were leading 2-0 until the 66th minute, but eventually lost 4-2 after a Giuseppe Rossi hat-trick and Joaquin counter-attack.
“I think the game was practically closed. We were in control in every way, even in the second half and had some more great chances to add to our tally,” the Coach told Sky Sport Italia.
“Then something strange and unthinkable happened. We lost a match that we had been dominating.
“How do we explain it? An explanation would be easy! In 10 minutes we destroyed all the hard work, both during and before the game. We managed to allow Fiorentina back into it and concede odd goals.
“This is football. We have to take these 10 nightmare minutes and learn from them. I continue to say this year will be very, very difficult.
“In these 10 minutes we did everything to help Fiorentina get back into the match, more than they had been at any stage. There are huge regrets.
“We struggled more last season and got a draw, whereas this time until the 70th minute it was all Juventus. This is football, nothing can be taken for granted.”
Conte brushed off suggestions Juve were lacking concentration ahead of the Champions League clash with Real Madrid on Wednesday.
“This was an important game in a fiery atmosphere, so we could not be distracted by Real Madrid. We were in the match from the start and only went wrong in those 10 minutes.
“It has happened a few times this season that we’ve conceded chaotic goals. We have to work on it. That is all.”
See the latest Serie A predictions and betting tips with Eurotips.co.uk