He's tweeted to his fans in Italy.
Google translate says this:
Dear Naples, is difficult, so difficult after four years ... And then I thought maybe it is better to say goodbye so: by borrowing before Uncle Pino and then to you, what people, the wonderful your people, you sang every Once a promise of eternal love ...
Napule is a thousand culure ... That I will every day in the heart, mind and skin ... Napule thousand fears ... Let him learn to love and you can not do without ... Napule is a voice de 'criatura that ascends Chiana chianu and you know ca' nun is Sulo ... And it is a unique feeling, this voice that captivates the soul ...
Napule is nu sun ... But so bitter sweet look behind every cloud ... Napule addore and 'sea ... A sea where you get lost and you can not do without ... Napule is na' soiled paper and nisciuno cares and everyone expects a 'ciorta ... Yes, but that card will go everywhere with me ... And I will wait to' ciorta ...
Napule is na 'walk fake viche miezo ATO ... I alleys, among the people, I spent some wonderful days ... Napule is all nu suonno and' all or sape 'munno But nun to know' the truth. .. I know it ... I discovered it, I loved it, I locked in your heart and that is why today my eyes are wet and dirty from this sea of this earth. My land. Hello guagliù, Forza Napoli forever.