Shortly after Al Jazeera America reported in December allegations of performance-enhancing drug use among NFL players, the league announced it would investigate the matter.
An NFL spokesman confirmed to NFL Media on Wednesday it plans to speak to the players tied to report at some point next month.
"We have been working with U.S. Anti-Doping Agency and Major League Baseball since these allegations were raised," NFL spokesman Joe Lockhart told NFL Media Insider Ian Rapoport. "Working with the NFL Players Association, we expect to talk directly to the players sometime next month."
Clay Matthews, Julius Peppers, Mike Neal and James Harrison were the four active players named in the report.