You forgot Alessandro Gamberini was even still a Napoli player, didn't you? Surprise!
Gamberini arrived at the Stadio San Paolo two years ago to help provide depth and experience to Walter Mazzarri's three-central-defender back line. After a poor season and with the arrival of Rafa Benitez and the 4-2-3-1, Gamberini was deemed to be spare parts, and was shipped off to Genoa on loan. He didn't play particularly well there either, with a combination of injuries and just plain being bad limiting him to ten appearances, mostly early in the season.
Now, Gamberini has been sold to Chievo Verona (after a brief flirtation with Leeds in England's second division and their new Italian owners) and signed a two year deal with one of the clubs that only barely survived the relegation fight last season. He's one of two new center backs for Chievo so far this summer, with Bosnia international Ervin Zukanovic joining on loan from KAA Gent in Belgium. According to Chievo's statement, Gamberini signed a two year deal with an option for a third, which is about the best a 32 year old defender coming off two bad years can hope for.
The transfer fee was not disclosed, but is not expected to be particularly significant. Napoli had little in the way of leverage in the negotiations and simply wanted Gamberini gone anyways. Chievo not being in the greatest financial shape certainly doesn't help matters much in terms of trying to get a notable fee for a player like Gamberini.
Best of luck Alessandro. Hopefully your career can get at least marginally back on track.