Arne Slot fielded a second string squad in the final League Phase match against PSV, which resulted in their defeat. In my opinion, if Arne Slot had not rotated his squad, we might have seen Liverpool leading the standings with 24 points. Meanwhile, PSG had a very hard time reaching the round of 16, so it is natural that they are not the favorites when facing Liverpool. Of course, I don't mean to underestimate PSG, but on paper Liverpool are more worthy of being the favorites.
The second string squad were fielded in that fixture because it was obvious they had almost nothing to loose if they don’t gwt to win that game so it was just ideal rotational technique was applied in that fixture as it did helped in the future fixture after that. I'm believing that Liverpool is going to have their main starting 11 against PSG because a whole lot is at stake in that particular fixture if Liverpool should loose it.
The last match of the first stage of the cchampions league was not important for Liverpool. Even then , Liverpool was able to perform very well even with the second-tier squad . And you are right that Liverpool will play against PSG with their main squad. We also saw in yesterday's match against manchester city that liverpool's boys played great. Liverpool's players are in good form and Arne Slot's match strategy is also very good. Liverpool's squad is also stronger and more experienced than PSG . So the chances of PSG winning this match are very low. psg will not win this match unless they are very lucky.