Sir Chris Hoy has revealed he's undergoing chemotherapy after being diagnosed with cancer last year.
The British Olympic icon announced the news on social media after wanting to previously keep his diagnosis private.
But Hoy is "optimistic" and is living his "life as normal" after being diagnosed a few months ago.
His statement read: "I have a bit of news. Last year I was diagnosed with cancer, which came as a huge shock, having had no symptoms up to that point.
Sir Chris Hoy has been diagnosed with cancer
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"I'm currently receiving treatment including chemotherapy, which thankfully is going really well.
"I'd like to extend my sincere gratitude to all the medical professionals for their amazing help and care.
"For the sake of my young family, I had hoped to keep this information private but regrettably our hand has been forced.
"Whilst I'm thankful for any support, I'd like to deal with this privately.
"My heart goes out to the many others who are also going through similar challenges right now.
"I'm optimistic, positive and surrounded by love for which I'm truly grateful. As you might imagine, the last few months have been incredibly difficult.
"However, I currently feel fine - I am continuing to work, ride my bike and live my life as normal.
"It's an exciting year of work ahead, not least with the Paris Olympics in July. I can't wait to get stuck in, have fun and share it with you all."
Hoy retired from competitive cycling in 2013, nearly a year after his heroics at the 2012 London Olympics.
Sir Chris Hoy won seven Olympic medals in his career
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He led Team GB out as the flag carrier during the opening ceremony and went on to become Britain's most successful Olympian ever with two more golds at the time.
Hoy ended his career with six gold Olympic medals and a silver with only Sir Bradley Wiggins and Jason Kenny winning more medals for Great Britain.
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Chris Hoy was Team GB's flag carrier at the London 2012 Olympics
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After retiring from competitive cycling, Hoy stepped into motorsport and even raced in the 24 Hours of Le Mans in 2016.
More to follow...