The Italian manager, who led the Bianconeri to five successive Scudetto triumphs from 2014 to 2019, returns for a second spell in Turin.
Juventus have confirmed Massimiliano Allegri as their new head coach following the sacking of Andrea Pirlo.
Allegri rejoins Juventus on a four-year contract, reportedly worth €9 million per season, until 2025.
The 53-year-old had a hugely successful first stint at the Allianz Stadium as he guided Juve to five Serie A titles, four Coppa Italia trophies, and two Champions League finals.
An official statement on the Juventus website read: “Massimiliano Allegri is the Juventus manager once more.
“Allegri finds a bench that he knows very well, a club that he loves and that loves him back, as today a new journey begins together, towards new goals.
“And now we are ready to begin again with Allegri, to build our future together; with his enormous professionalism, his moral strength, with the brilliant ideas of a coach capable of shuffling the cards, both on and off the pitch. With his smile, a sort of “signature”. With his way of understanding football and life with simplicity, with his desire to play things down and with the commitment to enjoy every beautiful moment that being at Juventus can give and will give.”