The Spaniard currently leads Mark Webber by 11 points, with Lewis Hamilton and Sebastian Vettel still far from out of the hunt on 21 and 25 points adrift respectively.
After a run of four wins in the past seven races, another Alonso victory and, with his trio of title rivals far enough behind him, then he will become only the ninth driver in F1 history to win at least three titles.
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Hide AdAlonso said: "I feel relaxed, although on Sunday I'll tell you how I feel. This is an important race, but then it was important in Monza, in Singapore. The last four or five races have been very important for us."