The former Real Madrid manager will follow Cristiano Ronaldo to the Turin club.
Spanish outlet Libertad Digital claims Zidane has agreed to take up a backroom role in October.
The Frenchman played for Juve between 1996 and 2001, where he won two Serie A titles.
His appointment will no doubt add pressure on current Juventus manager Max Allegri to win the Champions League this season.
Zidane guided Real to three straight Champions League crowns before he quit the club in May.