@kofigunner (I think) raised a very good point in the match day thread.
A lot of worries but the biggest worry is how lacklustre and slow he was in his possession. The main reason we spent £50m was to fix this issue so we can play out the back and transition up the pitch more smoothly and quickly, he was terribly slow in all of his decision making on the ball.
To be fair Burnley were really organised in their press, they cut off a lot of the passing lanes to the midfield. I think we saw last week some of his passing ability, I don't really have any concerns with him on that front. It's the 1v1 defending when teams go direct that is the concern.