Former Manchester United No 2 Steve McClaren concedes Sir Alex Ferguson's decision to ignore his advice helped them win the Champions League in 1999 against Bayern Munich.
The Germans took the lead at the Nou Camp thanks to Mario Basler's first-half goal.
United's hopes of a treble looked to be slipping away as Bayern continued to dominate and they could've been further ahead had they converted their chances.
The Red Devils piled on the pressure in the final 10 minutes and scored an equaliser in the 90th minute thanks to Teddy Sheringham.
McClaren was then content to see it through until extra-time but Ferguson was convinced they could find a winner, which we all know they managed to do.
When asked if he ever gave Ferguson tactical advice, McClaren revealed to Sky Sports : "Sometimes. I mean I remember the European Cup Final, we equalised and I said 'Look come on lets get back to 4-4-2' and he said 'No sit down Steve, this game’s not over yet' and as we all know it wasn’t.
"I was kind of the coach, he had more experience. If he asked my opinion yes I’d give it to him but majority of the time I was learning and learning quickly.
"He was just experienced and had that instinct to tell someone to warm up, to say “come on we’re putting him on”, it was just a case of he knew best so fully his instructions."
McClaren went on to manage Middlesbrough after serving as Ferguson's assistant.
He delivered the club's first trophy in 2004 which helped him earn the England job.
But his spell with the Three Lions ended with him getting the sack after England failed to qualify for Euro 2008.
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