UEFA have handed Lyon and Besiktas suspended bans from European competition after fan trouble marred their Europa League match last week.
Bans suspended for two years, clubs also fined
The one-season suspensions have been deferred for a probationary period of two years, European football's governing body said on Wednesday.
The clubs have also been fined 100,000 euros each.
Kick-off in France delayed by three quarters of an hour
Ugly scenes in the crowd delayed kick-off of last Thursday's quarter-final first leg at the Parc Olympique Lyonnais by 45 minutes.
Lyon were charged with insufficient organisation and a breach of safety regulations as their fans blocked stairways, set off fireworks and invaded the pitch after the home team's second goal completed a comeback 2-1 win.
Visiting Besiktas were charged with their supporters setting off fireworks, throwing objects and crowd disturbances.
Clashes started hours before kick-off after around 15,000 Besiktas fans arrived in Lyon, marching through the city centre and lighting flares.
UEFA: "Supporters of both clubs responsible"
Lyon said their fans sought refuge on the pitch after they were pelted with objects and flares from the upper tiers of the stadium.
"The CEDB (Control, Ethics and Disciplinary Body) has considered that the supporters of both clubs were responsible for the crowd disturbances at the match," UEFA said.
The teams' second leg is to be played in Turkey on Thursday evening.