William Hill on Tuesday installed Red Bull as 13/8 favourites to win the 2011 Constructors' Championship, ahead of Ferrari and McLaren who are both 9/4.

Alonso, who is 8/13 to win this year's title ahead of Sunday's Interlagos race, leads Mark Webber (11/5 for the title) by eleven points and is 7/1 to wrap up the championship this weekend.

Lewis Hamilton, who can still win the title, is 10/1 to do so.

Hill's spokesman Joe Crilly told Oddspreview: "Alonso is in pole position for this year's Championship but the odds suggest that it is anything but a formality.

"He will have to be at his very best in Brazil, especially with the Red Bulls breathing down his neck."

Sebastian Vettel and Mark Webber are the early 9/4 joint favourites to win at Interlagos, ahead of Alonso (7/2), Hamilton (9/2) and Jenson Button (16/1).