Peyton Manningsaid a report by Al Jazeera set to air Sunday that suggests he obtained performance-enhancing drugs was "completely fabricated, complete trash, garbage."
Manning angrily denied allegations to ESPN on Sunday morning that he used HGH in 2011.
The report is based on secret recordings made by a former intern at an Indianapolis anti-aging institute who now says he fabricated the allegations.
Al Jazeera sent British hurdler Liam Collins undercover to expose performance-enhancing drug use in sports. Collins made secret recordings of Charles Sly, a former intern at the Guyer Institute, where Manning was treated in 2011 following four neck surgeries.