Hegerty, 60, stars as the stern Governess in ITV's teatime quiz show The Chase. The buck stops with you.
"The weirdest thing for me is going in as myself", said the 30-year-old, who is in a relationship.
"So no, I don't think doing this will be tougher".
Redknapp does appear to know the troubles that await him in terms of I'm A Celebrity's often meagre diet, but he is not too fussed about it as he regularly skips breakfast and lunch.
Piers Morgan went in hard on Harry for signing up to the ITV reality show in a heated rant on yesterday's Good Morning Britian. "Eating won't be a problem for me".
As other famous faces including The Vamps' James McVey, X Factor's Fleur East and former footy manager, Harry Redknapp, have all but been confirmed the show as they touch down in Australia to take part in the survival show.More news: Sarri explains decision to leave out in-form Morata
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Fans of the show aren't impressed by ITV's mammoth pay out and aren't sure whether Harry will be fun to watch with one slamming: 'Harry Redknapp has been dug up and paid £500k... and for what? My son, Jamie, thinks I am definitely not the full shilling!
However, he said his grandchildren were "really excited" and that he was looking forward to being able to "exaggerate" his stories when he finally emerges from the jungle.
Redknapp said he will not mind missing meals but will struggle to be without his wife. We do everything together.
The 51-year-old explained: "I will do my damnedest in challenges so that we're not, any of us, hangry".
He led Portsmouth to a 9th placed finish in the Premiership in his first season, their highest at the time since the 1950s, before winning the FA Cup and finishing 8th in his second season.
John Barrowman has said that he wants to be known as both the King and Queen of the Jungle if he wins ITV's 2018 I'm a Celebrity...
She has replaced regular co-host Ant McPartlin, who has taken some time out of the spotlight after spending time in rehab and being convicted of drink-driving earlier this year.