Jacksonville Jaguars receiver Justin Blackmon was suspended without pay Tuesday by the National Football League for the first four games of the 2013 season for a substance abuse policy violation.
Blackmon, who caught 64 passes for 865 yards and five touchdowns during his rookie season last year, will be able to return to the Jaguars' active roster on September 30, the day after Jacksonville plays host to Indianapolis.
Blackmon, 23, will be able to participate in all pre-season games and workouts but will also miss the team's September 8 season opener at home against Kansas City and road games at Oakland and Seattle.
Details of the violation are kept private under NFL policy and medical privacy laws.
"I've made a mistake and I have no excuse," Blackmon said. "I'm truly sorry and disappointed in myself for putting the Jaguars in this situation and I look forward to putting this behind me and maturing and growing as a person."
"I will have a productive training camp and pre-season with my team, and during the suspension I will work hard to stay in top football shape and be ready to help the Jaguars when I return."
Jaguars general manager David Caldwell said he and coach Gus Bradley had spoken with Blackmon about the violation.
"He is well aware of our disappointment," Caldwell said. "I don't think there is any question that Justin is embarrassed and remorseful and coach Bradley and I are both confident he understands the obligations ahead of him."