LYON and Besiktas both face bans from European competition if there is a repeat of the crowd trouble that marred their Europa League quarter-final first leg in France on 13 April, Uefa say.
Both clubs have also been fined 100,000 euros (£83,800) after clashes between fans before kick-off.
The tie at Parc Olympique Lyonnais, which ended 2-1 to Lyon, kicked off 45 minutes late.
The return leg in Turkey takes place on Thursday (20:05 WAT).
SOURCE: BBC SPORT
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