Barcelona trained at midday on Wednesday at the Ciutat Esportiva Joan Gamper after flying back immediately after Tuesday's draw against Napoli in Italy.
The squad took part in a recovery session, with coach Quique Setien including six Barca B players in the session: Iñaki Peña, Ronald Araujo, Akieme, Riqui Puig, Collado and Ansu Fati, who is now practically a first-team player.
Someone was not involved on the grass was Gerard Pique, who came off in stoppage time in Naples after hurting his ankle.
However, sources close to the player say they expect him to be available for Sunday's Clasico against Real Madrid at the Santiago Bernabeu.
Barça are now totally focused on that game, in which they will be without the injured quartet of Jordi Alba, Sergi Roberto, Ousmane Dembélé and Luis Suárez.