Nick Grimshaw has been forced to pull out of Sport Relief’s celebrity challenge due to heat exhaustion.
The 35-year-old had to abandon a 35-mile cycle on Monday on medical orders when he was close to the finish and he also missed Tuesday's 24-mile leg of the journey, which is on foot across the Namib Desert.
The BBC Radio 1 DJ said: "I'm absolutely gutted not to be with the team today.
"I was mentally prepared for it but the medical team have decided I need to miss today.
"I got pulled by the medic just 2k from the finish line and treated for heat exhaustion.
"I'd been drinking, eating, resting regularly, but it came on so quickly.
"I feel much better today and I'll be fine, but they have advised that my body needs to recover so I can rejoin the challenge tomorrow."
Also on the expedition are Frankie Bridge, Karim Zeroual, Louise Minchin, Rob Rinder, Krishnan Guru-Murthy and Samantha Womack.
The group is taking on the 100-mile desert expedition over four days in which they will attempt to traverse the Namib desert in Namibia, Africa by foot, bike and ski
The expedition aims to "help break down the stigma of mental health and raise money for mental health services", according to Sport Relief.
Saturdays singer Frankie said the 35-mile bike ride was "probably one of the worst and hardest days of my life".
She added: "When I fell over on the sand yesterday I screamed because it burned me, that's how hot it was.
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"I know people at home are supporting us and that's what keeps us going."
Channel 4 journalist Guru Murthy said there were times during the journey when he was "genuinely scared".
He added: "The heat and terrain are brutal."
The team are hoping to have crossed the desert by Thursday on foot, bike and ski.
Chris Hughes was expected to take part in the challenge but was not included in the line-up after a brawl at the National Television Awards last month.
Meanwhile, Strictly dancer Oti Mabuse has signed up to co-host BBC1's Sports Relief alongside regular presenters Gary Lineker and Paddy McGuinness when it returns on March 13.