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PSG has no shortage of good players in their squad. However, when compared to Madrid, Munich or Barcelona, PSG's squad will lag behind. PSG won the Champions League this season because of Luis Enrique's mastermind, there is no denying this.
If PSG wants to dominate the Champions League next season, PSG will have to build a stronger squad. And Luis Enrique knows this very well. PSG also has a lot of money. So buying players will not be too difficult for PSG. However, it remains to be seen which players Luis Enrique considers suitable for his squad.
PSG will benefit if they can add Gavi to the squad. This midfielder can strengthen PSG's midfield. Very talented. He can also support PSG for a long time. However, I don't think Gavi will leave Barcelona now.
Gavi has openly stated that he will stay at Barcelona, so speculation about his future may have been answered. So if PSG want to sign a talented young midfielder like Gavi, it looks like they will have to looking for other alternatives now. I think the depth of the squad that PSG have at the moment is quite good, which is why they won the treble this season. Enrique may just need quality rotation options, to be able to keep PSG performance stable when faced with a busy schedule. Financially, we know that PSG are a rich club, they can sign any player if not hampered by FFP rules. PSG success this season has also increased their annual income, and given them more freedom to recruit new players.