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If Pochettino really wants Raphinha then maybe it won't happen because Xavi doesn't want to let him go. Raphinha is a key player in Xavi's game plan next season, not only him but I think Dembele is the same. There is a possibility that Raphinha will be sold, but not now because Barcelona still really need him.
Pochettino seems very rushed in his team building plans. He must control his desires and evaluate the team's performance, because of course there is still the upcoming transfer market that he can use to find the players he needs. Chelsea don't have to buy a lot of players, so their transfer policy has to be controlled.
The new Chelsea coach seems really ambitious to make big changes in the Chelsea squad. So that until now actually he is more focused on selling players. He even managed to release two players to the Arab League. And now, with the money the club got from selling these players, it seems that Mauricio Pochettino is optimistic about being able to bring in the players he needs. And he seems to have included Rapinha in his plans. But as you said, Xavi will not let Rapinha go this season. because it is true that Barcelona still needs him badly. Moreover, Barcelona will most likely fight harder this time in the Champions League. So that Xavi certainly has to have an adequate squad that can keep the team's performance well maintained and remain consistent even though they have to focus on two or more competitions.