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.
Luis Enrique did not just choose a player to replace Mbappe, he will try to bring in a top player who can be relied on and has sharpness in scoring goals. PSG is not experiencing financial difficulties because this club has abundant funds to recruit players. Several names have been included in PSG shopping list in the transfer market. Currently, Osimhen name is at the forefront of what PSG is pursuing. Rashford was also rumored to be a target for PSG because he was thought to be able to blend in with the tactics used by Enrique. PSG must succeed in formalizing several new signings to strengthen the team next season, the Champions League is still their main target, but if there is no improvement in the squad, it will be very difficult for PSG to win the trophy.
It is true that it is impossible for Enrique to randomly bring in players and be able to fill the space in the position left by Mbappe, but in reality Enrique stated that Mbappe is different player and it is difficult to find player who can truly resemble Mbappe.
He is player who is truly great in skill and contribution in every condition, Mbappe can do everything and this is why previously PSG retained Mbappe and many big teams were targeting him, apart from that Mbappe also has winning mentality and doesn't give up easily.
Another great thing about Mbappe is that he can hold the confidence of all PSG players that they are strong enough to win, this is the true spirit of PSG as long as Mbappe is still there.
There are several names such as Osimhen, Rafael Leao and also Marcus Rashford who are very close to buying PSG to fill the void left by Mbappe, but I doubt it will work even though it can be admitted that Serie A has been place where many great players have been created.
I still waiting for developments and seeing how Enrique works to resolve PSG situation of losing its spearhead, maybe he will really be able to get the players he hopes for but not in the near future.