Judging by last season, no one
Rafinha (loaned out), Sergi Roberto (promotion), Deulofeu (loaned out) and Carles Planas were (as far as I remember) the only ones that got picked by Tito to play in at least one match last season.
Maybe Planas will again play some minutes, but I doubt it. The rest of the talented players in the B-team are pretty much the new ones (Samper, Sandro, Bagnack, Adama) and Ié, Espinosa, Grimaldo and Dongou, who all struggled to get consistent gametime last season (bar Grimaldo, but he got injured and is 17 years old).
We'll have to see how it goes with them next season.