~Snip
Girona was initially doing well earlier last season but ever since they lost form, and Real Madrid won the title, their winning spirit declined drastically, and they have been struggling since then. Girona is still a developing club so nothing much is expected from them in the Champions league so let them just play all their matches and return home with pride because it is not easy to have a Champions league experience for the first time in the club's history. The only game among the three teams you mentioned that they can perform well a bit will be against AC Milan but for Arsenal and Liverpool, they can't really compete with both teams because the two teams are far stronger than Girona in every angle.
Milan is actually a team that is full of experience in the Champions League compared to Arsenal, even if Milan's performance is very erratic. Milan has only performed worse than Liverpool and Arsenal this season in the Champions League, while Milan has performed better than Real Madrid in the same competition.
To be honest, I don't expect Girona to win any points from the next 3 matches in the Champions League, that's because I believe the quality of the players between the teams is very different. Girona have changed and their performance is very bad, but in La Liga they have a pretty good performance. Meanwhile, Girona is just an ordinary team in the Champions League compared to Liverpool, Arsenal and Milan.