Derek McInnes was over the moon after guiding his Aberdeen side through to the quarter-finals of the Scottish Cup on Saturday.
"The performance is something I know we are capable of so I'm probably prouder of the mindset,” he said.
"When you are the underdog, it's normally about reinforcing confidence and getting belief in the team but we didn't have to work too hard at that this week.
"I know with the demands of Celtic and their standards, people will maybe look at Celtic's failings, but I think we restricted them. We never allowed the game to be stretched, we never allowed their better players to affect the game too much.
"I have been here as a manager and a player when you feel as if you are hanging in and I never felt that today. Even when it was 1-1, it was about what we can do to win the game. More importantly, the players believed they could go and win it, and that's brilliant to see."
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