Napoli have appointed Massimiliano Allegri as their new head coach on a contract running until June 2029.
The 58-year-old replaces Antonio Conte, who left the Serie A club at the end of May after two seasons in charge, having guided Napoli to the 2024-25 league title before last season's second-place finish.
Allegri, who was sacked by Milan at the end of last season, returns to the club where he briefly played during the 1997-98 season.
Napoli had been waiting for Allegri to resolve the termination of his Milan contract before completing the move.
One of Italy's most decorated coaches, Allegri won the Serie A title with Milan in 2011 before enjoying a trophy-laden first spell at Juventus.
Between 2014 and 2019 he guided the Turin club to five consecutive Serie A titles, four successive Coppa Italia triumphs and two Italian Super Cups, while also reaching the Champions League final in 2015 and 2017.
He returned to Juventus in 2021 and lifted a fifth Coppa Italia in 2024 before taking charge of Milan for a second spell for the 2025-26 campaign.