Juventus defender Leonardo Bonucci has declared their rearguard as "unbreachable".

Bonucci says their defence has been Juve's secret weapon this season.

"Our success at the back is an added value," the former Bari centre-back stated after Sunday's 4-0 win at Novara.

"I think our unbreachable defence is one of the secrets of this Juventus side."