Barcelona president Joan Laporta is facing punishment for entering the referees' room at the end of defeat to Real Madrid.
Ref Jose Maria Sanchez Martinez noted in his report that Laporta entered his room before being told to leave last night.
Mundo Deportivo says Laporta could be fined up to €3,600 or suspended for four years.
However, as it was a first offence, Laporta is expected to be given the minimum €602 sanction.
There has been precedent this season as Sevilla president Pepe Castro did something similar - and copped the €602 fine as a punishment.