The Glasgow club complained about "heavy-handed policing" as they crashed out of Europe and they could face charges over discriminatory chants - after the governing body were alerted to footage posted on the internet - which appears to show some of their fans singing sectarian songs after the match.
A UEFA spokesman told PA Sport: "We have received the last report we were waiting for. Now UEFA will look into the matter. It is very likely we will start an investigation regarding this match."
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