Getting him in, even if just on loan until the summer, seems like an obvious deal to do. For all the worries about our defence, we've been really lacking creatively and he'd help with that. He's also a more natural goalscorer than most of our midfield/attack.
You won't find anyone near his level available for free or on loan in this window. We need numbers, but we also need quality. Adding someone like Olmo to the attack for no cost allows us to spend big on both a defender and a holding midfielder.