The 71-year-old was hospitalised after contracting the deadly bug and needed to be put on a ventilator to make it through.
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The inspirational athlete opened up about the terrifying experience on the show and how he channelled his Olympic spirit to fight it.
Kenny said: "I had that oxygen mask on, which was strapped to my face, reminded me – I thought back to people on the ward begging to die, pulling the mask off their face.
"The doctors were pleading with people to reconnect their oxygen.
"And I laid there, and I could see it and hear it, and people were ripping their masks off.
"They were speaking to their family and then ten minutes later going out in a black bag."
He continued: "And I thought to myself, I can't move my head, I'm breathing 100 per cent oxygen and my mindset went back to Mexico City.
"And prior to Mexico City, I had to do some training on bikes and treadmills with oxygen on.
"And I thought, if I'm going to win this race, this is part of the preparation, and I could put up with this."
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GMB co-host Piers Morgan then asked how it felt to leave the hospital.
Kenny gave an emotional recounting of the moment, which lead to him breaking down in tears.
He said: "When they pushed you around them corridors and you go through them lock up, zip up air chambers, and I could see the double doors at the end of the corridor.
"As we got closer, it opened and we went out into the sunlight and the fresh… oh god, I'd have given anything.
"And it was so emotional, even now."
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Kenny then broke down in tears, before saying: "I've come back to life and I come back to my child and I come back to my grandchildren.
"The good story was, my little granddaughter, who's four she wrote a letter to Father Christmas.
"She said, 'Father Christmas, I don't want any presents this year. My sister Isla doesn't want any chocolate buttons any more. All we want is our granddad home' – and I got home, and I can't wait to see them."
After the emotional interview, the presenters joked with Kenny, leaving Susanna admitting: "I'm glad you left us smiling because I thought I was going to be a pile of tears then."
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