Poli would be a good sub, now we only have Pogba as a sub for CM
The other CM's are used as CB and LWB, while we use Padoin and Giach( both not natural CM's) as CM's
Poli is an ok player, not wow.. As Back up he would be ok, but than we should sell Giaccherini for sure. In my opinion the priority is a lwb and a good striker.. Than we can routate Asamoah in midfield with Marchisio and Vidal, idem Pogba..
Haven't seem him too often 4 or 5 times this season, but from what I have seen, he's an energetic runner/b2b midfielder, sometimes aggresive and a decent solid passer.
I would say a poor mans Marchisio is the best way to describe him.