Sport says Quique Setién has called up 21 players for the trip to face Napoli in the Champions League last 16 first leg on Tuesday.
Braithwaite has been included but cannot play after arriving as an emergency signing out of the winter window.
The coach wants to help him keep bedding into the squad and getting to know his team-mates.
Sergi Roberto isn't in either, because of his thigh injury. Barca B players Araujo, Collado and Riqui Puig are involved, plus Inaki Pena.