So, Nainggolan is a typical DM?
Not much of a classic or box-to-box CM?
I think his biggest qualities are marking, grinta, stamina.. what about skills... can he pass the ball, can he dribble, is he an intelligent player?
Honestly I haven't watched him enough to know these things...
Cagliari generally play him on the side of the diamond, where he has generally plays as an aggressive box-to-box player, though he'll play a much more disciplined game against the big sides (I've seen him play deep in front of the defence and even as a trequartista in an emergency). Think he's playing in a slightly more disciplined fashion this season since he's got Murru pushing up from left back.
The easiest comparison to make would be to Vidal, but without the same ability to make the difference in the attacking third of the pitch. Similar determination, aggression, stamina, ball winning ability.
I'd suggest his general passing ability is probably also comparable to Vidal's, in general, but he doesn't have the vision that Vidal does to make the occasional really incisive pass.
Not a dribbler, but pretty solid technically and good enough at positioning his body that he is hard to dispossess.
Always seemed a pretty intelligent player to me. Playing on the side of the diamond you have to adpat to all sort of different roles depending on who you are playing and the state of the game and he's always looked good regardless of whether he's pushing up aggressively or if he's almost playing as a second defensive midfielder. Good at judging when to go and press aggressively and when to hold position.
He's just one of those players that - pretty much from the first time I saw him - I thought he was a player who knew what he was doing. And he's developed since then, of course - less silly fouls, better decision making.
Haven't seen enough of him playing deep in front of the defence to know if he'd be suitable for Juve in that position or if he'd be big too aggressive and too inclined to press instead of holding back.
As much as 18m sounds a lot - and I think it is a little more than he's really worth - he just seems to be a player that Conte could turn from a good player with a lot of potential into an really excellent player. I suspect he'd end up feeling like one that got away in a couple of years of Juve don't sign him, even if you can argue about whether it's really an essential signing for Juve right now.
When it seemed that Juve were looking at Asamoah and Nainggolan as potential midfield signings, I thought Nainggolan was the one Juve should go for - and we all know (and many of us knew) that Asamoah was and is a very good player.
As much as people will want a more creative player - and Juve probably could use one of some sort - this guy just seems such a perfect fit for Conte's Juve.