The Hillsborough charity single is the bookies' odds-on favourite for Christmas Number One this year.
The track, which will feature John Bishop, Robbie Williams, Mel C, Paloma Faith and Beverley Knight, is out on December 17.
Rebecca Ferguson, Peter Hooton, Pete Qylie, John Power, Dave McCabe and Gerry Marsden have also pledged to participate in the release of 'He Ain't Heavy, He's My Brother'.
This year's X Factor winners' single is tipped to be sung by Ella Henderson, who remains the frontrunner to win the current season of the competition.
Jahmene Douglas and James Arthur are also thought to be likely candidates for the job.
It has been reported that this year's X Factor victory release will be in aid of charity, in place of the usual finalists' group single, which has been a running tradition since 2008.
According to Oddschecker, the Hillsborough fundraiser is 5/6 favourite to come out on top, ahead of the X Factor winner on 11/8.
One Direction (10/1), Cheryl Cole (16/1) and Girls Aloud (33/1) are also distant contenders.
This year's X Factor stars: The story so far