Media reports said a man and his daughter were injured as a firework was thrown towards Juventus fans in Turin, where the Italian club - down to 10 men - wiped out a three-goal deficit from a 5-2 loss in the first leg to force extra time in their Champions League playoff tie.
Turkish champions Galatasaray, who scored twice in extra time to qualify for the round of 16 with a 7-5 aggregate win, were also fined 40,000 euros ($46,000) by UEFA's disciplinary committee for the fans' behaviour.
Galatasaray's appeal against the punishment was rejected on Wednesday.
Liverpool visit Galatasaray on Tuesday, with the second leg set for March 18.