Xavi's main focus if Dembele goes to PSG is that he wants to sign a good right-back. Some of the money from the sale of Dembele will go towards fulfilling that wish, so I don't think Xavi would be considering Felix so soon.
So far, news has spread that Barcelona is considering recruiting João Cancelo, who in the end was not made permanent by Bayern Munich. João Cancelo is one Xavi might have in mind as a defender, so it's certainly going to be well worth the effort. If Cancelo really joins Barcelona, then clearly Barcelona seems ready enough to perform well in the Champions League next season.
The right back position has been one heck of a position that Barca haven’t find a better player at since the departure of Dani Alves. Many players like Nelson Semedo, Jerome Frimpong and its likes have all been here and gone. Since the arrival of Xavi he has entrusted that position into the hands of Kunde and Arjauo, both of which are not natural full backs but center backs so no matter how brilliant they play it still leaves holes there. So it will be a good acquisition getting a proper right back this summer.
Jao Cancelo will definitely be a good signing because not only can he play the position perfectly he also doubles as left back sometimes. Also Cancelo adaption will be easy since he is experienced and has been in a team that plays similar football with Xavi’s pattern. It is said that the money received from Dembele’s sale would be used to finance the deal. I also think they need another forward because there is already lack of proper depth there. Although Felix would be too expensive for Barca right they should look elsewhere.
Griezmann is not a "fresh" signing for Atlético, it's just that he was initially on loan with an option to renew and buy. It is a pity that he did not find a better option than Atlético, where he has a conflict with Simeone and where, due to the style of play, he cannot fully reveal his talent. If he goes to Saudi Arabia, it will also be sad.
Signing permanently now then means he is fresh from it then. I don’t understand how downhill Griezmann career has gone. He forced a move to Barca that we would say are playing tiki taka football that should be suitable for him but it didn’t work out and after two season forced a move back to ATM again and now the complain is still about playing pattern. I would say Griezmann needs to leave Laliga and probably look elsewhere in European football probably back to his home country France maybe he would win some trophies