His fellow hosts, Scarlett Moffatt and Joe Swash, revealed that he was unwell and carried on gallantly, but fans were left wondering what was wrong with him.
Now the comedian, who came second to Scarlett when they competed in the 2016 series together, has now revealed on his Instagram that he was rushed to HOSPITAL after sustaining a serious injury on the set.
Taking to his social media profile, Joel shared two photos of himself to reveal that he'd had a nasty accident, telling his fans what happened - with one photo showing him getting stitches in his head, and another with a bandage around the wound.
He wrote, 'Unfortunately due to unforeseen windy circumstances blowing the set onto my head during rehearsals, I won’t be able to present Extra Camp this evening. I had seven stitches like a big brave boy and I’ll be back tomorrow.
'To be honest, I’m less worried about my health and more worried that the show will be better without me. Half a day off school to go home and watch neighbours! Woo! GOOD LUCK @scarlettmoffatt and @realjoeswashy.'
CHECK OUT what each of the celebs are getting paid this year
I'm A Celebrity 2018 salaries - heat slider
1 of 12Swipe through to see what the cast of I'm A Celeb... 2018 could be earning
2 of 12Sair Khan
The Sun reports Coronation Street actress Sair Khan may have secured a £40,000 payment for her stay in the jungle.
3 of 12Anne Hegerty
The Chase star Anne Hegerty could take home between £60,000 to £80,000.
4 of 12Nick Knowles
It's thought TV presenter Nick Knowles has landed a big deal of around £200,000.
5 of 12Fleur East
Celeb PR Ed Hopkins told The Sun: "Negotiations appeared to go on for a while but I would think Fleur would have been offered between £50,000 and £70,000."
6 of 12James McVey
The Vamps star James McVey is thought to have secured a pay cheque of £40,000..
7 of 12John Barrowman
According to The Sun, a source revealed: "Bosses wanted him on the show for years so they'd have paid between £120,000 to £200,000 to get him on board."
8 of 12Malique Thompson-Dwyer
20-year-old Hollyoaks actor Malique Thompson-Dwyer may have only been paid about £15,000.
9 of 12Harry Redknapp
It was recently revealed that football manager Harry Redknapp is being paid £500,000 for his stint in the jungle.
10 of 12Emily Atack
According to The Sun, Emily's fee could be as low as £15,000 but sources think she will have been paid £40,000.
11 of 12Rita Simons
Celebrity PR Ed Hopkins told The Sun he believes EastEnders star Rita could be paid £80,000 to £100,000 for her three weeks in the jungle.
12 of 12Noel Edmonds
It was recently revealed that Noel Edmonds may be heading into the jungle this year and it's claimed he'll be the highest paid contestant ever at £600,000.
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The 32-year-old then posted two videos to his Instagram Story, joking that he'd been wearing Scarlett's jumper at the time, which was now covered in his blood and promised to wash it before giving it back.
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He also made the good point that as they're in Australia, he's unable to watch the show - and asked his fans to let him know how it was going, even revealing that he'd woken up to Joe Swash kissing his forehead.
The celebs have been at camp since Sunday night, and so poor Joel missed one of the first opportunities to present with previous winners Scarlett and Joe. And though they the two of them did a stellar job, his absence didn't go uncommented on.
Taking to her own Instagram, Scarlett shared a cure snap of Tuesday's gang, writing: "What a team... just missing my right hand man & fellow jungle hammock swinging buddy Joel".
Get well soon, Joel!