Girona is almost certain to be eliminated from the Champions League because they were only able to collect three points and in terms of experience, the results obtained by Girona when competing in the Champions League did not show any readiness at all. There will not be many changes for the existing teams because in the Champions League, experience may be needed and for teams that are not favored, they may have the same chance even though they recruit several players in the transfer market.
Milan still has a chance to qualify for the next round, but they need to work harder because to qualify for the next round by relying on the play-off route, they also need to see the results of several competing teams, but if you look at the points they have, the chances are still quite large.
Girona performance was expected as this level before start because they have no big name and their performance in La Liga were amazing but with these sources teams can't go strong into Champions League with this new format they have good result as able to won one game with next is surely going to be not easy for them while AC Milan is having good form, and they can pass through them without any problem for having good chance of jumping into knockout stage.
Girona can stay in the middle of the La Liga, but now their future into UEFA is no certain because they are not able to have sources for competing here but if we have them in top half for few years in La Liga then surely we can expect better things for them in future with they are surely able to increase quality and performance with some well experienced players which will increase their chances for giving good results.