Cristiano Ronaldo is willing to return to Italy in the January transfer window, and may be interested in Napoli as Napoli were also interested in the Manchester United striker last summer and are reportedly still in interest to this day.
Erik ten Hag wants to replace Ronaldo with Patrik Schick from Bayer Leverkusen, Jonathan David from Lille or Moussa Dembele from Lyon. AS Roma striker Tammy Abraham, also interested in Manchester United.
I'm not sure about Napoli's interest in Ronaldo. Because not much time ago, Napoli made a statement that they had no intention of signing Ronaldo. I don't see any reason for them to change their mind now. Everything is going fine for them in the Serie A and Champions League both. Osimhen is also performing solidly. I don't think they would be interested in Ronaldo at the moment.
Patrik Schick might be a really good move. He is one of the very talented young strikers now. He is actually 26 but this is a very young and productive age for a striker I believe. Leverkusen are still having very difficult days and they are near the relegation zone. Maybe this could be an advantage for Manchester United to sign him easier.