His decision making is too poor right now for an attacking player you would rely on. But for a CM who you just ask to run up and down, I think it's acceptable.
Like if he could run 80% as much as Matuidi in the same position but give you that little extra ability on the ball when he's in the final 3rd beside Ronaldo. Could be a great position for him. Every time I watch him, I think his best quality is his running and defensive contribution, somehow.
Edit: Also there is the issue of how the hell do we get him in the team right now. He's miles behind Costa for RW and we know Sarri will play Costa every week if he's fit. So right now one of our only young players is just not going to play.