If AC Milan is in need of a number 9 this season, they should sign Rasmus Hojlund from Manchester United. There's a big chance that Rasmus Hojlund would perform well at AC Milan since he's Serie A proven. Manchester United wants to sell Rasmus Hojlund this season and they are yet to get a buyer as it stands now. If AC Milan approached Manchester United to sign Rasmus Hojlund this season, AC Milan would sign him easily because they would have no rival.
If Milan wants to get Hojlund from United, I think they need to compete with Napoli, who have already shown interest in the United striker. There are even rumors that they are close to reaching an agreement.
That hasn't happened yet, and I think Milan still has a chance if they have a more attractive offer to be considered by United and Hojlund. However, it may ultimately depend on Hojlund's interest in choosing his new club.
I thought Napoli deal to sign Rasmus Hojlund from Manchester United didn't workout because Napoli didn't include a buy option in Rasmus Hojlund loan deal, but if Napoli is still interested in signing Rasmus Hojlund this season, I believe that shouldn't stop AC Milan from submitting a bid for Rasmus Hojlund because AC Milan could end up hijacking the deal from Napoli. In my opinion, if AC Milan rivals Napoli for Rasmus Hojlund, I think Rasmus Hojlund will prefer a move to AC Milan over Napoli because if Lukaku returns from injury, Rasmus Hojlund will have less playing time at Napoli.
This is still under negotiation, and Napoli has agreed to the €45 million price tag set by Manchester United. I think Conte really wants Rasmus Hojlund after their striker Lukaku's injury. Napoli's management has no choice but to quickly bring in a new striker to fill the void left by Lukaku's injury in the months since. Otherwise, Napoli's performance will be questionable due to the lack of a capable striker.
It's only a matter of time before negotiations begin. I'm quite confident Napoli will sign Rasmus Hojlund over AC Milan due to the team's pressing needs.