His skillset, he isn't really suitable to be a winger - quite slow and a poor shooter, in many ways similar to Silva/Iniesta. Sam Lee has mentioned in his articles several times that Bernardo was initialy bought to play as a CM, Silva's heir. Pep played him there once (vs WBA in the LC), but later was forced to move him to the wing as City couldn't get Sanchez.
I have some doubts about Bernardo's ability to shift to CM position. There were rumours (from Sam Lee or Marti Perarnau, don't remember exactly) that Guardiola's been initially shocked by Bernardo's inability to follow his instructions. If another 'genuine' winger comes, Bernardo has to deliver as a CM or drop to the bench I'm afraid.
Pep's plan for City includes stretching the pitch by speedy wingers, Bernardo doesn't fit this description.