Koeman became the first Barcelona manager in 81 years to lose his first three El Clasicos, with the Catalan giants suffering a 2-1 defeat to Real Madrid.
After the contest, the Dutchman's car was attacked as he tried to leave the stadium, with a number of supporters showing their frustration by surrounding his vehicle.
Barcelona have condemned the incident and insisted that they "will take security and disciplinary measures" to ensure that the situation is not repeated in the future.
"FC Barcelona publicly condemns the violent and disdainful acts that our manager experienced when leaving the Camp Nou. The club will take security and disciplinary measures so that such unfortunate events do not happen again," read the statement posted on social media.
Blaugrana, who have now lost three of their last five matches in all competitions, will be looking to return to winning ways when they travel to Rayo Vallecano on Wednesday night. body check tags ::