Cristiano Ronaldo rescued a 2-2 draw for Juventus at home against Sassuolo on Sunday but the result left the way open for Inter Milan to take top spot in Serie A.
"We didn't use our heads," lamented Juventus boss Maurizio Sarri.
Leonardo Bonucci had scored early for the eight-time reigning Serie A champions but Jeremie Boga and Francesco Caputo hit back for Sassuolo before Ronaldo's point-saving intervention from the spot in Turin.
Juventus have a two-point lead on top of Serie A but can be overtaken by Inter Milan, who host struggling SPAL later on Sunday.
Sassuolo, in 12th, claimed their first ever point at Juventus, and held Sarri's unbeaten champions to their third draw of the season.
"We got into trouble on our own, we didn't use our heads in the first half, as the goals conceded show," said Sarri.
"Every time we lost the ball we left ourselves open. We had a first half without application and little energy from the character point of view.
"But we were coming off two games in which we used up a lot of energy against Atalanta and Atletico Madrid.
"The reaction came at the end and we could even have won it."
- 'Recover brilliance' -
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"The lad is crazy completely. Yesterday I called him in the hotel and told him to enjoy it, that if he didn't sleep it was normal, but not to have too many expectations, too much anxiety."
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