Francisco Trincão, Pedri, Carles Aleñá, Matheus Fernandes, and Oriol Busquets are expected to start training as Barcelona first-teamers next week, with an eye towards starting pre-season with the team soon thereafter.
They will not play for the Catalans this season, as they are not eligible yet. However, they would start adapting to life as a first-team player. Then, they would start pre-season with the club. From then, we shall see if they remain with the team or if they are loaned out.
It’s understood the first three (Trincão, Pedri, and Aleñá) would be the most likely to remain at Barcelona.