To elaborate, or at least what I think from his story:
Rüdiger is our top priority. We value his potential and ability to play from the back at such a young age. Thing is, though, we do not agree that he is worth 30 mil. Euro. If we don't strike a deal with Roma, soon, we will press on to give the 30 mil. To Napoli for Koulibaly, due to experience,intelligence and ball play, which he has. With his contract extension stalling, Chelsea are really interested and as Di Marzio's story said and I quote: "He COULD ( not will) be at Chelsea next season.