I agree with the principle that the fringe/rotation players in our squad most defintely should be talented young players IF they're good enough. Having said that we should have enough strength in depth to field a top class subs bench. Fellaini before his injury was our go to CM after Pogba and Matic. Periera should get a chance to earn that spot, but shouldn't be a shoe in for it. We should have a player in that spot which is good enough to challenge Pogba or Matic for their first team place.