Sir Bradley Wiggins has pulled out of winter sports show The Jump after breaking his leg.
Britain's most decorated Olympian said he was "gutted" that the injury forced him out of the competition.
The 36-year-old said he suffered a small leg fracture while taking part in the show's snow cross training.
He wrote on Twitter: "Gutted to be leaving The Jump. I wanted to give you an injury update ...
"Seen a specialist, I have a small leg fracture & need to rest for 3/6 weeks. Good news no surgery or cast required..
"Huge thanks to the crew & good luck to all of the cast. Due to the way the show is filmed I'll still be on until show 4, so tune in.
"No horror smash, small training injury which means I can't compete. No terrible break, no cast, just need to rest it."
A Channel 4 spokesman said: "Bradley injured his leg during training and although keen to continue in the competition he will no longer take part following the fourth show in the series."
The eight-time Olympic medallist and Tour de France winner joins a long list of contestants to have suffered painful injuries while participating in the Channel 4 show.
Former Olympic gymnast Beth Tweddle required neck surgery after a crash last February, while former Holby City star Tina Hobley is still recovering from leg and arm injuries sustained on last year's series.