On 7 November 1984, Celtic beat Rapid Wien 3-0 to advance in the European Cup Winners' Cup, but it didn't count.
The teams met in the tournament's second round, with Rapid winning the first leg in Vienna on 24 October, 3-1. Thirteen days later, Celtic hosted the second leg in Glasgow, where they drew level on aggregate with first-half goals from Brian McClair (32') and Murdo MacLeod (45'). Tommy Burns then added another goal in the 68th minute.
Four minutes later, Burns was involved in a incident that saw the referee eject Rapid's Reinhard Kienast. As the Austrian were protesting the decision, midfielder Rudi Weinhofer went down clutching his face, apparently hit by an object thrown from the stands. He had to leave the game, which left Rapid down to 10 men as they had already used all of their substitutes. Captain Hans Krankl threatened to lead his team off the pitch in protest, but the match eventually resumed after a 15-minute delay. It ended 3-0 to Celtic, which put them through 4-3 on aggregate.
Rapid protested the result, however, and a UEFA appeals panel determined that the injury to Weinhofer justified a replay which they ordered to be played at least 100 miles away from Glasgow. So the teams met at Old Trafford in Manchester on 12 December.
Rapid won that match 1-0 to advance 4-1 on aggregate and ended up going all the way to the final in Rotterdam, where they lost to Everton, 3-1.