The new I'm A Celebrity series kicks off at 9pm on Sunday on ITV hosted by Declan Donnelly and new presenter Holly Willoughby.
And according to The Sun newspaper, TV presenter Noel will be one of them after signing a reported £500,000 deal.
Other celebrities taking part this year include DIY SOS host Nick Knowles, pop stars James McVey of The Vamps and Fleur East, former EastEnders star Rita Simons, Coronation Street actress Sair Khan, Inbetweeners actress Emily Atack and Hollyoaks actor Malique Thompson-Dwyer.
Redknapp said he does not think the programme will be more challenging than being a football manager, although he is admittedly none the wiser.
He said: "I have got bad eating habits".
Betway's Alan Alger said: "At the age of 71 and having lived most of his life as a professional footballer or football manager, Harry Redknapp is set to be pushed well outside of his comfort zone".
"The weirdest thing for me is going in as myself", said the 30-year-old, who is in a relationship. The buck stops with you.
"I am scared of everything you have in there and I am scared of all the trials", said the 31-year-old. "Why am I even doing this?" Who's going to wash my trousers?.I'm pretty useless at looking after myself", while Anne added: "I feel I seem to have spent most of my life avoiding anything that might possibly resemble camping outdoors.
Made in Chelsea star Georgia "Toff" Toffolo was the victor of the 2017 edition of the show and this year's line-up includes a famous football manager, an X-Factor runner-up and a former soap star.
Holly is standing in for Ant and said: "I'm just looking after it until [Ant] gets back".
Earlier this year McPartlin was fined £86,000 and given a 20-month driving ban after admitting driving while drunk.