Napoli president Aurelio De Laurentiis says Rafa Benitez has been appointed the club's new manager.
Benitez, 53, had been looking for a new job with his contract as interim Chelsea manager ending this summer.
De Laurentiis posted a picture of the pair shaking hands on Twitter and told followers: "Rafa Benitez is the new coach of Napoli. A man of great international experience. A leader."
Benitez will replace Walter Mazzarri, who has joined Serie A rivals Inter.
Ex-Liverpool boss Benitez guided Chelsea to victory in the Europa League while a third-place finish in the Premier League ensured Champions League football at Stamford Bridge next season.
Despite that success he remained unpopular with a section of the Chelsea support after succeeding Roberto Di Matteo in November, and had underlined his intention to leave the club at the end of the season.
Real Madrid coach Jose Mourinho has been widely tipped to be rejoin Chelsea this summer.