Pep has used all three subs, and Ederson or Bravo are shown red or cannot continue. I really don't know how good any of the squad are as a GK but my guesses would be (no particular order):
Fernandinho (can play many positions)
Stones (he's tall and relatively athletic)
De Bruyne - just think it seems he would be good in goal if required
Fernandinho (can play many positions)
Stones (he's tall and relatively athletic)
De Bruyne - just think it seems he would be good in goal if required