An NFL spokesperson released the following statement:
"Matt Prater of the Denver Broncos has been suspended without pay for the first four games of the 2014 regular season for violating the NFL Policy and Program for Substances of Abuse.
Prater will be eligible to return to the Broncos’ active roster on Monday, October 6 following the team’s October 5 game against the Arizona Cardinals.
Prater is eligible to participate in all offseason and preseason practices and games."
Prater addressed the media on Monday regarding the situation.