The former Deal or No Deal host, 69, will be the last star to join the line-up this year – reducing the total number of contestants from 12 to 11 for the first time since 2007.
Viewers of the series are convinced another late arrival is set to join Noel at camp or else the current teams of five members each will be uneven.
An ITV source said: “Bosses for I’m A Celebrity spent so much on signing Noel for the show that there’s only 11 contestants planned this year.
“They have really pushed the boat out and splashed the cash more than ever before – meaning a change to the format had to be made.
“Harry Redknapp and Noel cost over £1million between the two of them and they’ve spent good money on the likes of Nick Knowles and Rita Simons too.”
Noel will arrive late into the camp where he will join the likes of X Factor singer Fleur East, EastEnders star Rita and Chase baroness Anne.
Speculation was rife that Megan McKenna was joining the line-up after she was pictured sunning herself in Australia.
But the reality star had flown over to appear on the Extra Camp panel with hosts Scarlett Moffatt, Joel Swash and Joel Dommettt.
Love Island star Olivia Attwood is also set to join Scarlett and co on the spin-off show this week.
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On Sunday’s show viewers saw Anne breakdown after the yellow team failed to secure the luxury camp.
The yellow team, consisting of Anne, Fleur, Rita, Vamps star James McVey and actress Emily Atack, will be forced to eat rations and sleep on the jungle floor for the foreseeable future.
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