Barça faces this summer with the intention of keeping the champion squad together. Deco confirmed this in a recent interview where he made it clear that the main goal of this transfer window isn't to sign, but to renew.

In this regard, the key renewals are especially focused on Lamine Yamal. He is about to reach adulthood on July 13, and that makes his renewal an urgent matter. The club wants to avoid any temptation and ensure that Lamine succeeds at Barça.
The signing Barça wants to achieve
The second major goal Barça has in this market is to strengthen the attack on the left wing. In this sense, the technical staff's favorite is Luis Díaz, current Liverpool player and a key figure both for his club and the Colombian national team. His speed, power, and directness fit perfectly into the blaugrana system.
However, Barça isn't putting all their eggs in one basket. As an alternative, Marcus Rashford from Manchester United is strongly considered. He is a footballer with similar characteristics, although with a more central profile and a greater goal-scoring ability.
The move in Liverpool that would help Barça
Amid these negotiations, an external move could play in Barça's favor. This involves Florian Wirtz, Bayer Leverkusen's star, who reportedly has decided to reject both Bayern Munich and Real Madrid in order to try to sign for Liverpool. This choice, not yet official, has immediate consequences for the Catalan club.
Wirtz's arrival at Liverpool would mean an overcrowded attacking front for the Anfield team. Logically, that would alter the balance of minutes and roles within the squad. The main indirect beneficiary of this situation could be Barça, if they know how to act quickly and precisely.
Closer
If Florian Wirtz joins Liverpool, it would open wide the exit door for Luis Díaz. The English club, aware of the Colombian's market value, could be more willing to negotiate his transfer.
Moreover, Luis's fit in the Barça playing style is ideal. Not only because of his profile, but also because he would allow for a better-balanced attack, giving more options to a team that, if they keep their core and secure this signing, can aim for everything.