Understandably, with a three-point lead over City at the top, Fergie will be happy with a draw on Sunday.
He said: “We need to come out unscathed. With so much at stake I wonder if there will be a bit of caution from both clubs.
“Roberto Mancini and I will both have to think deeply about our selection and tactics and there may well be an element of playing safe.”
But Fergie did concede: “The passion of the fans can easily spill over so that tactics go out of the window as emotions take over and each side will both slide into gung-ho mood.
“An early goal can also dictate the shape of the game so we could be in for a masterclass of attacking football from both teams — in which case, hold on to your hats and enjoy.”