City are keen on signing Koulibaly this summer, and a move still looks likely, but it is proving difficult because of the tense relationship between the clubs.
Jorginho had appeared set to move to the Etihad from Napoli in 2018, with a deal agreed, but everything changed at the last minute and he instead joined Chelsea.
Napoli president Aurelio De Laurentiis says that City are still so annoyed about how the transfer fell apart that they will not deal with the Italian club directly, even when trying to sign one of their players.
The president did admit that Koulibaly will be sold this summer, though, as long as his asking price is met.
‘Koulibaly and [Arkadiusz] Milik are both on their way out, transfer market permitting,’ said De Laurentiis.
‘So, if the transfer market allows us to sell these two excellent players, we will know how to replace them. If not, then we’ll discuss it again next year.
‘Kalidou is a great person, I would be terribly sad to lose him. But there is a time for everything, even to move apart.’
The 29-year-old defender has made 246 appearances for Napoli in all competitions and won the Coppa Italia with the club this season.