I played Tonali in a 4231 as the cdm that sits back and breaks up play. He has scored 5 goals in 10 apps for me. The squad i use him in is as follows..
Ter stegen TOTGS
Lala FS Kamara Lenglet Carlos
Bruno Fernandes SIF FS Tonali
Baby Butra POTM Ben yedder Bernado Silva
My god is he good. I have used the likes of RTTF Kante, baby Vieira & all your other good alternatives and none of them cut the mustard like this guy. Hes so strong which is accompanied by his high aggression which is so vital in this Fifa. he is only 5"11 which in my opinion is perfect height. (I found Kante too small and Vieira too clunky). His shot power is second to none and his acceleration gives you that extra space in midfield. He is honestly that good that i don't pair him with a second defensive midfielder as he clears up everything.
Acceleration - Guys get away after the first touch is lethal
Shot Power - When on Target (See con) his shots are so powerful that they
are past the keeper before he has time to react.
Strength and aggression - If this guy doesn't win the ball back first time, he will rip it from them at the second attempt. ultimate powerhouse.
Interceptions - Guy is like dynamo in cdm. Knows where your through balls are going before you pressed that button.
I wouldn't necessarily call these cons but more slight niggles
Finishing!! - Now he has scored 5 in 10 for me from cdm but he could of had so many more!!
Agility - can be a bit slow to turn but tbh because of his high acceleration he just comes out of turns like a rocket.
Linkability - this is the main one. He is obviously hard to link unless pairing with an Italian icon you're going to have to have no broken links with this card.
Price - Now i know he will mos likely drop in price but i picked up for 1.1m. I dont think this is bad for a card with these statas but i know it wont be for everyone.