Peyton Manning Angrily Denies Doping Allegation

The popular NFL quarterback pushes back against the accusations, calling them "a joke."
1:57 | 12/28/15

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Transcript for Peyton Manning Angrily Denies Doping Allegation
We turn next to a shocking allegation against football star Peyton manning. Claims that he used a human growth hormone. Banned by the NFL. But tonight, he's not backing down. This player known for his dominance on the field is now playing defense. Here's Mary Bruce. It's a joke. It's a freaking joke. Reporter: Tonight, star quarterback Peyton manning is furious and fighting back. Telling ABC's sister network ESPN that allegations he used performance enhancing drugs are simply not true. It's completely fabricated, complete trash, garbage, there's some more adjectives I'd like to be able to use. It really makes me sick. Reporter: Explosive allegations against a member of the first family of football. The Denver bronco is a five-time league mvp. A new Al jazeera documentary claims manning's wife was supplied human growth hormone, a substance banned by the NFL, while manning was being treated at an Indianapolis clinic after neck surgery in 2011. The report features a former pharmacist, Charlie sly, who spoke with an undercover reporter. All the time we would be sending Ashley manning drugs. Like growth hormone, all the time, everywhere, Florida. And it would never be under Peyton's name, it would always be under her name. Reporter: Manning says it never happened. Have you ever used hgh or any other performance enhancing drug? Absolutely not, absolutely not. Reporter: Tonight, sly is recanting his story in this online video. The statements on any recordings or communications that Al jazeera plans to air are absolutely false and incorrect. Reporter: Sly tells ESPN he made up the story to test the undercover reporter. And according to the clinic, sly did not intern there until two years after manning was treated. Cecilia, tonight Al jazeera is not commenting on sly or manning's claims that their report is false. That documentary is still slated to air later tonight. Cecilia? A strong denial. Mary, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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