A person with knowledge of the situation says Pro Bowl linebacker Von Miller will miss the first month of the season for violating the NFL's drug policy, pending an appeal.
The person spoke to The Associated Press on condition of anonymity because the league hasn't announced any punishment.
ESPN first reported the pending discipline of Miller, who didn't answer calls to his cellphone Monday from The Associated Press.
The league has a confidentiality clause on such cases. Broncos spokesman Patrick Smyth said the team is unable to provide any comment.
Miller was the league's Defensive Rookie of the Year in 2012 with 11½ sacks and he topped that last season with a franchise-record 18½ sacks while making it to his second straight Pro Bowl.