Legendary former forward Bobby Charlton was part of the 1968 side who became the first Manchester United team to triumph in Europe.
Speaking to Sky Sports today, he answered queries as to why that feat could not be repeated for 31-years, and what chances United have this evening as they take on Pep Guardiola's Barcelona.
On whether the Premier League champions should have savoured more continental success between 1968 and 1999 (their second European Cup triumph), Charlton said, "You've got to be lucky with injuries and suspensions, there are always stumbling blocks to success, but Sir Alex [Ferguson] knows how to win.
"He knows how to win," he reiterated.
On what could separate the two teams this evening, as both sides look to secure the trophy in Rome, Charlton added, "The preparations and the way [United] play, the attitude always goes forward.
"We've always had exciting players," he continued. "They have proved by winning three [successive] Premier League titles that they are the best in our league, now we have to prove we are the best on the continent."
Alan Dawson, Goal.com