Peyton Manning
The Broncos quarterback faces allegations that he obtained performance-enhancing drugs through a clinic where he received treatment for an injury.
British hurdler Liam Collins went undercover for Al Jazeera.
The clinic originally told reporters that Charlie Sly worked there in 2011. It now disputes that confirmation.
It's not a complete denial.
WHAT'S HAPPENING
The Broncos quarterback fires back at claims that he used human growth hormone.
The quarterback and his wife received human growth hormone in 2011, an alleged supplier asserts in a new undercover investigation.
The proud Oakland, California, native is a front-runner for Defensive Rookie of the Year.
Manning wound up producing one of the worst performances of his career.
Quarterbacking kind of runs in the family.