Villa boss O'Neill: Chelsea defeat not the worst
He said: "We were well and truly beaten in the game at Chelsea and I said afterwards it was the worst result of my life.
"Probably even worse was getting left out of Nottingham Forest's first European Cup final in 1979 as a player. I still find it hard to forgive the manager (Brian Clough) for that.
"That was heart-breaking because I didn't think I would get another chance to play in the final. Luckily it came around again the following year."