Asked if Sir Alex Ferguson's retirement gave him an advantage at last, Bruce erred on the side of caution, and realism.
"I don't know if it's a better chance," he said.
"To have any chance against them, you have to play well on the day and that's all we can hope for. You would never write off Man United. Just because they've changed manager doesn't mean that mentality's going to go away. It's engrained in them. 'For a lot of the players, they're used to success.
"They know how to win a league. You can never write them off because they are capable of going to win eight, nine or 10 games on the spin. Usually, they get stronger in the second half of the season. That's always been the case with them.
"You either love them or hate them but you can't argue it's a magical day when you play against them."
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