Two security guards received minor injuries after being attacked by Marseille fans during the second leg of the Europa League last-16 match at Athletic Bilbao Thursday, Spanish police said.
The police also said three supporters of the French team had been detained.
Marseille won the game 2-1 and advanced to the quarter-finals 5-2 on aggregate.
There was also trouble at Bilbao in the previous round against Spartak Moscow when a police officer died after clashes involving both sets of fans outside the stadium.
