I've seen a bit of him at the world cup and was impressed with how much ground he can cover. Good engine, runs for days and a good ball winner. Plays a lot different at Fiorentina to his country. More involved in the buildup and can ping a few balls out wide which would be good for players like Rashford.
He does anticipate situations well and uses his body to get across players before he gets a foot in at the right time to intercept/recover. However, he's already prone to making fouls and I think that will only get worse in the PL where it's more fast paced/physical. He's quick to cover ground off the ball but on the ball, not the quickest. Not an out and out number 6 but will come in to do a job.
However, I do think there's some red flags. It's concerning that no other major European club wants him. Our only competition for this guy is Fulham and Forest. Bit of a red flag also Fiorentina are easily willing to let him go, asking price as low as 20-30m, even their willingness to do a loan deal which from our part is a disgrace. And from what I have heard, he's their main player in their buildup/in possession.
I think he'll come in and do a job, bit like Fred/McTominay did/do for us but maybe more polished. We'll be looking to upgrade in a few seasons. Age is 27 so he's entered his prime too, you expect him to give us a certain level of performance consistently. He's decent and does his role which we need at the moment.