Who was Manchester United's toughest opponent during Sir Alex Ferguson's era?
The answer is not Liverpool, Chelsea, Manchester City, or even the invincible Arsenal.
Fergie once stated that his worst nightmare was facing Pep Guardiola's Barcelona.
"Barcelona is the best team in Europe.
There's no doubt about it.
They are the best team we have ever faced.
It was extremely difficult to defeat a team with their style of play.
No other team could trouble us like Barcelona."
Fergie said this because he suffered two defeats to Barcelona in the Champions League finals in 2019 and 2011.
Manchester United, at that time, had many star players, such as Rio Ferdinand, Wayne Rooney, and Cristiano Ronaldo.
However, they were still powerless against Barcelona's Tiki-Taka style of play led by the trio of Iniesta, Xavi, and Lionel Messi.
As of 2023, Manchester United has only managed to defeat Barcelona once on the Champions League stage.
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