Girona who lost against Madrid in the weekend with a very poor performance don't really have much resting period and if they some how get a point against Liverpool then they have tried their best but I can't say they will even show something positive after that disappointing performance against Madrid.
If Liverpool don't dominate this game from the start to the end then I don't think they have gotten over that surprise they got against Newcastle. The Reds are seen as the favorite even with the odd from the bookies and Liverpool have been up to the task both in the champions league and the EPL than their opponent who are not impressive in both the UCL and the La Liga. This is a chance for Slot to redeem himself ahead of their next EPL game.
Arne Slot drew his last away game to Newcastle, so what's to say that he won't lose this one even though they have had enough resting time?
Liverpool are not ready to lose this game but just like you said about the shocking defeat Atalanta gave Liverpool, it can happen tonight but I don't feel Liverpool will allow that mistake happen again. Atalanta is far way better than Girona this season even in this champions league, so there is no way they can beat Liverpool even if things we least expected can happen in football, not tonight. Slot is not a happy man since he lost that chance against Newcastle but the only way he can smile tonight only if he gets a win against Girona. This game is very important for him to continue that unbeaten streak, to me is going to be a 1-3 in favor of the English side.