Trouble started just before kick-off of the last-16 second leg tie at home to CSKA Moscow when between 100 and 150 fans squared up to police outside the stadium.
According to sources, they threw projectiles which damaged police vehicles.
Eight police officers sustained injuries during the fighting, and three arrests were made.
Meanwhile, there were similar troubles in Bilbao, as Marseille fans scrapped with the Basque police force. There were injuries there too, as a security officer was stabbed in the neck with a sharp object.