According to The Sun, bosses at Channel 4 have confirmed Joe and Zara are in Austria "undergoing assessment" after being roped in at the last minute to replace a slew of injured stars forced to pull out.
Heather Mills is also thought to be lined up to appear.
I'm A Celebrity... Get Me Out Of Here NOW! co-host Joe may be able to lean on girlfriend Stacey Solomon for support and advice as she competed in the reality show last year.
This series of The Jump has seen four celebrities withdraw through injury: Olympians Beth Tweddle and Rebecca Adlington, actress Tina Hobley, and Made In Chelsea star Mark-Francis Vandelli.
Retired gymnast Beth's injury is particularly serious. She underwent neck surgery this week to fuse fractured vertebrae together. She was injured after crashing into a barrier while training for the show, which is filmed in Innsbruck, Austria.
Beth's parents have been keeping fans updated on the athlete's recovery, posting the most recent statement to Facebook two days ago.
It read: "The medical staff here in Austria have been fantastic, they have been so helpful, patient and incredibly attentive. We cannot thank them enough for what they've done for our daughter.
"Our thanks also go to the production team who have been helping and supporting us, and everyone who has sent a get well message to Beth. We've been reading every message to her and it really does make a difference knowing that there are so many people wishing her well. Thank you for your support.
"Since her surgery, Beth has managed to walk a few steps whilst being assisted by the nursing team. She is still very tired from the operation but the medical team are pleased with the progress she is making. At the moment we aren't certain of the timescale for her recovery. We are taking each day as it comes and will update you when there is further news."
A spokesperson from Channel 4 has told Reveal in light of recent comments from viewers: "The Jump is now in its third series and, since launch, 46 celebrities have taken part successfully.
"Though it is a new course the events have been designed to be no more difficult than in previous years and all contributors have undertaken a rigorous training programme to prepare them for the show," they explained.
"All winter sports carry some element of risk, but in light of the number of injuries this year, Channel 4 has asked the producers to review safety procedures again to further reduce the prospect of accident."
Despite already having strict protocols in place when it comes to the show, Channel 4 informed us that every event and training plan is now being reassessed so that such protocols are as 'tight as can be' when it comes to the safety of the celebrities taking part.
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