There has been an improvement in performance from most of Manchester City's main players in the last few games, so I think Pep Guardiola can rely on them. Without too many injuries, I think Manchester City's main squad is still better than PSG's main squad. The reserve players are not too bad, it's just that when the team is down, the main team will also perform badly.
Manchester City certainly has to maximize its opportunities to get several players in the market. They need a good midfielder and also a productive winger, of course this will help them increase their chances of winning in each match. The competition in the second half of the season will be more difficult, as will the remaining Champions League matches.
For now the changes that have occurred are getting better for Man City and they have had a positive trend in the previous few matches so that when they face PSG they will be a little more convincing. But the match will take place at PSG's home ground so the pressure will also be greater and Pep Guardiola must try to do something so that his players do not lose momentum to get full points in the match.
Midfielders or wingers may need to be brought in to complete the team's strength and that must be seen according to Pep Guardiola's needs because now they have other players in those positions but their contribution cannot be relied on by him so this is the best opportunity to bring in the players needed.