The allegations against Peyton Manning came from a report that said the NFL star's wife received shipments of human growth hormone

Credit: Kevin Terrell/AP

The NFL is conducting an “ongoing and comprehensive” review of the accusation that Denver Broncos quarterback Peyton Manning used illegal performance-enhancing drugs.

The allegations came last month from an Al-Jazeera report that said the professional athlete’s wife, Ashley Manning, received deliveries of HGH, human growth hormone, from an Indianapolis anti-aging clinic while her husband was recovering from neck surgery.

Charles Sly, a former pharmacy intern who spoke to the news outlet unknowingly about drug use among professional athletes, has since recanted his story (see video below).

NFL vice president of communications Brian McCarthy says the review incorporates “obtaining and reviewing records, conducting multiple interviews and working with other entities.”

The league is working with the MLB and the U.S. Anti-Doping Agency.

There is no completion date for the investigation, but McCarthy says it will not be finished prior to the 50th Super Bowl on February 7, where the the Denver Broncos will play the Carolina Panthers.

When the report first surfaced in December, Manning vehemently denied the claims.

“The allegation that I would do something like that is complete garbage and is totally made up. It never happened. Never. I really can’t believe somebody would put something like this on the air. Who said this is making stuff up,” Manning said in a statement to ESPN.