It would be a shock but not a total shock because both have played very well whenever called upon, and City have struggled against good counter-attacking sides.
Solid defending comes down to more than the two central defenders. It involves keeping the ball as well, and it involves a defensive midfield. Rodri is settling in. I have seen him have very good, and poor games. We're struggling in midfield too. We have Fernandinho and Silva who are on their way out, and new players on their way in, and everything combined leaves us vulnerable.
I think we will go back to Ota and Fern but I suspect Pep is constantly thinking about alternatives. I suspect he doesn't want to damage the self-confidence of young players but I think Garcia and Harwood-Bellis already feel they are going to make it. One bad game is not going to set them back irreversibly.