Four former winners of Steve Brookstein, Leon Jackson, Shayne Wardand Matt Cardle are all reported by The Sun to have had their songs left out of the anniversary celebration planned for the weekend after next.
That show will see the contestants remaining in the contest tackling songs by previous acts - with winners Joe McElderry, James Arthur, Leona Lewis, Alexandra Burke and Little Mix all represented.
But One Direction and Olly Murs will see their songs covered, despite not having won their respective series.
A source told the paper: "With such a massive roster of successful artists from the past 10 years, not all winners could be included in the final song choices."
But it also quotes a mole as saying: "It is a slap in the face for the winners who won't be covered.
"Bosses have obviously chosen the former stars who they think still resonate with viewers and who have had the most success."
Matt Cardle and James Arthur have been clashing again this week.