It is very likely that Enrique will try to find replacement for Mbappe, but there is no certainty who will really be worthy to replace Mbappe in the PSG squad considering that they are team that has great players who really retain them.
If Enrique doesn't immediately look for player who can replace Mbappe, I also doubt that PSG will be able to play well, especially in an important competition like the UCL.
Everything running low and this is really out of the picture. We've come to realized that Kylian Mbappe was the most valuable player in Paris Saint Germain and also in the general Ligue One. He's unstoppable and on fire each time he's with the ball. PSG headcoach, Luis Enrique will not depend on Kylian Mbappe because there's quite more to deal with and winning become straight and easy going. Who's Kylian Mbappe replacement? Perhaps none for now and his absence will really affects the club's performance and stats next season.