World Cup winner Marco Tardelli branded Juventus "soft" for their defeat at home to Napoli.
Tardelli believes Juve gave up after Kalidou Koulibaly scored his winner.
"I lost championships in the final weeks, the psychological discourse now counts," said Tardelli.
"After Koulibaly's goal I saw a resigned Juve, nobody went to get the ball, they were soft."
Juve now lead the Serie A standings from Napoli by one point.