The Italian giants have dominated the league in recent seasons but have struggled for consistency this campaign
Maurizio Sarri warned Juventus they cannot afford to throw away points as they did in Saturday's 2-1 Serie A defeat to Hellas Verona after becoming "accustomed to winning" over the past few years.
Juve appeared set to open up a six-point gap at the top of the table when Cristiano Ronaldo scored for a club-record 10th successive league match in the 65th minute.
But Fabio Borini levelled with a clever finish 14 minutes from time and Giampaolo Pazzini completed the unlikely turnaround late on, converting a penalty after Leonardo Bonucci had deflected Marash Kumbulla's header onto the crossbar with his arm.