Sir Alex Ferguson admits he harbours selection regrets concerning both the 2008 and 2011 Champions League finals.
United reached the showpiece twice in three years at the turn of the decade, defeating Chelsea in the first on penalties after a 1-1 draw in 2008.
They faced a dominant Barcelona side in 2011 at Wembley and were swept aside 3-1.
Speaking to MUTV, Ferguson has revealed his regrets over squad choices in both.
Despite beating Chelsea to lift his second Champions League trophy at Old Trafford, the Scot believes not picking Ji-sung Park in his final squad was a possible mistake.
“It was a really great bunch of players with a great attitude about them and a good, strong squad,” he said. “My problem in the 2008 final, maybe I even regret it to this day, was I left Ji-sung Park out completely in the final.
“He’d played such a great role and that’s the problem when you get to these finals.”
Ferguson says that he would go on to leave Dimitar Berbatov out of the side to face Barcelona three years later, and that the Bulgarian “didn’t deserve it”.
“At Wembley, I did it to Dimitar Berbatov and he took it badly. He didn’t deserve it,” he said.
“No player deserves to be left out of the final. That’s why we try hard at these European seminars with the coaches to try to get 11 subs in the final.”