Im not sure what his deal is but I dont think hes clinical enough to play close to goal for a top team. I also dont think is passing is quick enough for Sarri system as a 10. I will say his physical ability on the ball and work rate could be useful in the midfield. His passing ability is good enough to be a Khedira replacement if he "gets it". I actually think that a midfield of Pjanic,Rabiot/Matuid, Ramsey and Berna is strong enough physically