The comedian, who presents the ITV2 spin-off show alongside Scarlett Moffatt and Joe Swash, was smashed on the head by a falling sign during rehearsals.
Joel had to have seven stitches in his head, and was seen on social media wearing a massive bandage wrapped around it.
However, he has assured fans he will be back presenting ‘Extra Camp’ on Wednesday night.
Posting a picture of a doctor patching him on on Instagram, Joel 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.”
He added: “Half a day off school to go home and watch neighbours! Woo!”
He later shared a video on his Instagram story, saying: “Thank you for all your concerns. I’m OK, got this cartoon bandage on and I was wearing Scarlett’s hoodie, which I got blood all over. Sorry Scarlett, I will wash it!
“I can’t actually watch the show because I’m in Australia so let me know what’s going on. Joe and Scarlett are the best. Genuinely I fainted and I woke up and Joe was kissing my face.”
An ‘I’m A Celebrity’ spokesperson added to the MailOnline: “A freak gust of wind blew over the Extra Camp signpost and it caught Joel on the back of the head.
“He was taken to a hospital in a production car and given seven stitches. The team wish him well and look forward to him returning to the show soon.”
Joel joined ‘Extra Camp’ last year after appearing as a ‘I’m A Celebrity’ contestant during the 2016 series, where he finished runner-up to Scarlett.
‘Extra Camp’ airs nightly after ‘I’m A Celebrity’ on ITV2.