Competition holders Rangers would have been eligible to compete in the Cup Winners' Cup, but were banned from European competition in the 1972–73 season due to the violent disturbances at the 1972 European Cup Winners' Cup Final.[1]
^Gammon, Clive (10 June 1985). "A Day Of Horror And Shame". Sports Illustrated. Archived from the original on 2012-11-04. Retrieved 16 June 2013. The malady has afflicted Great Britain for more than 20 years, though it probably received wide attention in the sporting world for the first time in 1972 when, in what became known as the Battle of Barcelona, fans of the Glasgow Rangers rioted, causing their team to be suspended from European competition for a year.