The report, “The Dark Side,” is the result of a monthslong investigation in which Liam Collins, a British hurdler, went undercover in an attempt to expose the widespread nature of performance-enhancing drugs in global sports. As a cover story, Collins tells medical professionals tied to the trade of performance-enhancing drugs that he is hoping for one last shot at glory at the 2016 Olympics in Rio de Janeiro, Brazil. Manning is just one of many high-profile players the report names and raises questions about.

Manning issued a statement Saturday night strongly denying the allegations, claiming that “whoever said this is making stuff up.”