Both PSG and Manchester City are in an uncomfortable situation in the Champions League. If PSG is very eager to win the Champions League once and then the trophy will be stored in the cabinet, then it is very unlikely that PSG will give up amidst Manchester City's unstable conditions this season. This match will be used well by PSG because PSG will act as the home team and for both of them will play the game in their best form so that it will not be remembered by many fans if they become a team that fails when the new Champions League format is implemented.
Yes both PSG and Manchester City are feeling a lot of pressure in Champions League. PSG really wants to win title and put trophy on their shelf. So they probably can not give up especially since Manchester City has been playing inconsistently this season. PSG will try to take advantage of this chance especially since they are playing at home. Both teams will try their best to avoid being remembered as team that failed in first year of new Champions League format. This game is very important and it should be very exciting and competitive match between two of best teams in Europe.