Juventus has rumoured will release Ronaldo, I think this is a bad decision if they are released him this january. i think Juventus still need him to take a chance to win, but he is not a players who can follow Pirlo's instruction, this is the reason of this rumour coming. However, Pirlo is new as coach, i think to early to decide about Ronaldo
Every 2 months we have this rumor since he arrived here in Italy.
Even in the 1st year after 6 months we got those rumors.
Juventus has a contract with him if the wants to leave before the end they will need to pay to Juventus an amount wanted by Juvenuts.
If they want to exchange Ronaldo with Mbappè they probably will do, otherwise I don't think he will leave before the expiration of his contract.