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 play-off 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 (£34,800) 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 18th.