I think Milan will no longer be interested in him. Although I am also convinced that there are likely other factors blocking Boniface's transfer to Milan, apart from his knee injury.
Milan needs a striker, and the rumor is that they want Hojlund after the deal with Boniface failed. I just assume that the final considerations that led to the failure of the transfer were not just due to the knee injury.
From the live video involving the player Victor Boniface and a certain tiktok celebrity he talked about his knee injury being the only thing that is stopping him from joining AC Milan and looking at how the whole thing is happening I think the deal will no longer happen as AC Milan has also been linked to other players and Hojlund is a potential player that will assume that position so if that happens there will be no deal between Leverkusen and AC Milan.
Reports stated that Victor Boniface failed medical test which means it was nothing except for the knee injuries that was the reason for the failure of his deal move to AX Milan. The ACL injuries was what made Milan management changed their interest on Boniface. Maybe it will interest you all to know that he sustained the injury in his time at Bodo/Glimt before signing for Leverkusen and since he been playing so well after a successful surgery but Milan management thinks otherwise after discovering of his one time ACL injury as they fear it could affect his performance.