Juventus have dropped a point in their Champions League group against AC Milan and lost the tie for the first time since the 2011/12 season.
Juventus have won just one of their past 12 league games, and now sit third in Serie A, two points behind Inter.
Coach Antonio Conte’s men had scored three goals in the first half, but they did not score until 90 minutes into the second half.
They were not able to convert a penalty in the final 15 minutes, with Milan captain Gianluigi Buffon making it 2-0 in the 66th minute.
A penalty was awarded to Juventus at the end of the game, with the ball going over the bar.
Milan goalkeeper Antonio Candreva saved from the penalty spot, but Juventus’s Gianlulio De Laurentiis put his side 2-1 ahead before the break.
The Nerazzurri took a 2-2 draw at home to Udinese on Thursday, with Mario Balotelli’s late winner giving Udinese a 1-0 lead at the Stadio San Paolo.
Juve are now two points clear of second-placed Roma and third-placed Inter in the standings.