United dashed Arsenal's hopes of getting their hands on the championship trophy with a 2-1 victory at Old Trafford on Sunday.
Now only Avram Grant's Chelsea can prevent them retaining their crown.
But Ferguson has already seen a remarkable swing in the title race. Arsenal were five points clear two months ago; now they are nine adrift with four games remaining.
That is why he remains guarded even though his side have taken 22 points from a possible 24, the only blip coming at Middlesbrough a week ago.
Ferguson said: "I am not counting my chickens, put it that way.
"I am not getting carried away as I know what football can do to you. My team is keen to do well and the players are showing great consistency.
"We never give up, which, of course, is a priceless quality to have.
"That's the kind of spirit we will need in our remaining games. Hopefully that will continue and we will win the league."