Lyon and Besiktas have been handed suspended sentences and will both face heavy European bans, if there is any repeat of the type of incidents that marred the sides' Europa League quarter-final tie in France last week.
The tie was held up for almost an hour because of fans fighting in the Parc Olympique Lyonnais stadium before kickoff, with flares and other projectiles also being thrown.
BREAKING: Lyon and Besiktas given suspended two-year European bans by UEFA. #SSNHQ— Sky Sports News HQ (@SkySportsNewsHQ) April 19, 2017
UEFA have now handed both clubs two-year suspended bans, meaning that if anything of this nature occurs again, they will be prohibited from entering European competition for two years, while both clubs were also fined £83,800 each.
Meanwhile, a Besiktas supporter has been sentenced to two months in prison for his actions during the events.
The 27-year-old male was caught on camera knocking over a barrier and punching a steward, before being arrested.
"I had drunk a lot and I got caught up in it. I really regret it. It was stupid," the fan claimed via an interpreter at his sentencing, as quoted by ESPN.