Forwards: Lionel Messi, Kylian Mbappe, Hugo Ekitike
Lionel Messi went back to collective training exercises late this week after missing time in earlier sessions. He is available and Galtier doesn't seem to like the idea of giving him any rest, so there's that.
Kylian Mbappe is the face of this team and will play even on one leg. On top of that, he's hunting for weekly records and trying to help PSG reach 99 points on the year, so he has no reason to skip games for the remainder of the season.
With so few options available outside of those two and Carlos Soler banged up... oh, wait a minute! There is a little (not literally) man called Hugo Ekitike sitting on the bench more often than not that maybe (just maybe) should start getting some reps at the highest level of play. So I'm betting on Ekitike leading the team on Sunday, although I for one am very unconvinced he'll do anything good for PSG.