Barcelona have condemned supporters for attacking Ronald Koeman's car as the coach left Camp Nou following Sunday's Clasico defeat to Real Madrid.
Goals from David Alaba and Lucas Vazquez earned Madrid a 2-1 win, with Sergio Aguero replying with a late consolation.
Koeman has now lost all three Clasicos as Barça boss and as he left the stadium at the weekend his car was surrounded by venting supporters.
They called him names and some even kicked his car, leading Barça to release a short statement.
"FC Barcelona publicly condemns the violent and disdainful acts that our manager experienced when leaving the Camp Nou," it said.
"The Club will take security and disciplinary measures so that such unfortunate events do not happen again."