Napoli have replaced coach Roberto Donadoni with Walter Mazzarri after a disappointing start to the season.
Donadoni's future at Napoli had been the subject of intense speculation for the last few days after a poor run of form in Serie A.
Sunday's 2-1 defeat at Roma was the last straw for the club's hierarchy and they have moved quickly to axe the former Italy coach, who only succeeded Edoardo Reja in March, and bring in Mazzarri as his replacement.
"Napoli announce they have released Roberto Donadoni from the role of head coach and appointed in his place Walter Mazzarri," read an official statement.
"The club want to thank Donadoni for the work done in these months and wish him the best of luck for the future."
Napoli currently sit in 15th spot having collected just seven points from as many games, despite the heavy investment in the summer.
President Aurelio De Laurentiis has made it clear that he is keen to transform their fortunes after deciding to part company with sporting director Pierpaolo Marino last week.
Mazzarri, who left Sampdoria in the summer, is believed to have agreed a deal until June 2011 at the San Paolo and begins against Bologna on October 18.
The 48-year-old was previously at Napoli as assistant to coach Renzo Ulivieri during the 1998-99 season.