Davide Biondini fired Cagliari ahead after 16 minutes but Juve turned the match on its head as Mohamed Sissoko (31) and Pavel Nedved (38) put them ahead at the break.

Cagliari pulled level through Jeda after 54 minutes before Alessandro Matri sealed an unlikely win with his side's third after 78 minutes.

The loss was Juve's second in four days following their 2-1 reverse to Udinese on Wednesday, and Claudio Ranieri's second-placed troops could find themselves nine points adrift of leaders Inter Milan and behind AC Milan if results go against them tomorrow.

Cagliari, meanwhile, are up to seventh and increasingly in the hunt for a place in Europe next season.

In tonight's other game, Udinese came from two goals down to deny Napoli victory in a thrilling 2-2 draw at Stadio San Paolo.

All the goals arrived in a crazy 21-minute spell at the end of the opening half as the hosts took the lead through Ezequiel Lavezzi after 24 minutes while Marek Hamsik doubled the advantage three minutes later.

Udinese hit back through an Antonio Di Natale penalty after 32 minutes while Fabio Quagliarella rescued a point for his side with a brilliant equaliser on the stroke of the interval.