Al-Jazeera will air an investigative report Sunday evening, titled The Dark Side: Secrets of the Sports Dopers, which reportedly connects several athletes, including Denver Broncos quarterback Peyton Manning, to a doping ring, according to the Huffington Post's Travis Waldron and Ryan Grim.
The documentary reportedly alleges that the Guyer Institute, an Indianapolis anti-aging clinic, provided Manning with human growth hormone and mailed supplements addressed to his wife, Ashley Manning, following the quarterback's 2011 neck surgery.
"All the time we would be sending Ashley Manning drugs," former Guyer Institute employee Charlie Sly said in the documentary, per Waldron and Grim.