They in previous transfer window got JP Hauge who is a great young player though he isn't getting much time as he did in Bodo/Glimt but still I think he will be a regular in starting lineup soon.
I hope so, I really regretted the lack of playing time for Hauge, Milan took quick move to sign him. but when they succeeded, he only became a player who mostly playing as a substitute in the 2nd half.
Apart from that, the rumors I heard that AC Milan will bring Mohamed Simakan from Strasbourg as a defender. If I'm not mistaken, it's 20 years old.
Yes, Simakan has also become a Milan target, but for now, Tomori is the player who is Milan's main target. It could be a delay in bringing in Simakan due to financial problems, so Milan are looking for options for players that can be brought in at a lower price.