If he only played in cups, I'd accept it, but seeing him brought on in PL games?
As I said, you've got to rest/sub players sometimes. Dembele, Paulinho & Capoue represent a much-of-a-muchness for me and Paulinho is he most expensive of the three and the most liable to nick a goal. So if you're going to bring on any of the three, for me it is often going to be Paulinho. Until such time as we upgrade central midfield areas.