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I don’t particularly think that without Mbappe, PSG will face hardships. At least not in Ligue 1. Football is not played by 1vs11, rather it's a team game. Yes, it can be argued that Barca became arguably worse after Messi's departure but they weren't really that good when he left.
If you talk about PSG, they have good finances, a solid coach, and a decent amount of players in the club still. If they play their cards right, they can still dominate the Ligue 1.
About the UCL, Luis Enrique would need good reinforcements, as they couldn’t win it even with Mbappe. He needs to sign a proper striker and then need to balance out the whole squad, and if they do that, they might do well in the knockouts.
Luis Enrique is a fantastic coach. He cannot, however, simply plug someone fresh in and hope for everything to be rainbows and sunlight. It goes beyond merely replacing someone. Its about attatching the correct fit. Its about locating players who can rise to meet most important needs. PSG must adjust their perspective. Their priorities should be on creating a cohesive unit rather than merely assembling stars. They will only be able to overcome those demanding Champions League evenings by this means. So, are they able to do? Can they adjust devoid of Mbappé? Years will pass. One thing is clear though: it will not be business as usual.