UEFA's Icelandic match delegate Geir Thorsteinsson reported City fans for booing the Champions League anthem before the side played Sevilla at the Etihad Stadium on Oct. 21 and faced widespread criticism for his actions.
City fans have booed the anthem for more than a year because they were unhappy the club was penalised under UEFA's Financial Fair Play (FFP) rules and the body's lack of action when CSKA Moscow allowed a section of fans into a 'behind closed doors' Champions League tie in October 2014.
In a statement issued on Friday, UEFA said: "The UEFA Control, Ethics and Disciplinary body has decided to close the disciplinary proceedings."
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
There was no immediate response from the club, who are currently top of the Premier League and face Liverpool on Saturday.
(Reporting by Mike Collett; Editing by John O'Brien)
