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Bills wide receiver Stevie Johnson injured

Buffalo Bills wide receiver Stevie Johnson left practice after injuring his left hamstring Friday morning. Johnson, Buffalo’s top receiver, pulled up on a route during a red zone drill two hours into practice.

Johnson was evaluated by Buffalo’s training staff and walked slowly to the locker room assisted by two people.

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Bills coach Doug Marrone said after practice that he did not know the severity of the injury and that Johnson will be evaluated by team doctors.

‘‘It would be a major concern when we talk about it during the season, but right now, I think a veteran player that has proven himself, we’ll just see what the doctors say and it is what it is,’’ Marrone said. ‘‘We’ll deal with it from there.’’

Jackson suspended

Baltimore Ravens cornerback Asa Jackson was suspended without pay for the first eight games of the regular season for violating the NFL’s policy on performance-enhancing substances.

Jackson received a four-game suspension as a rookie last season for the same reason. This suspension is for eight games because it’s his second violation.

Jackson played in only two games last season for the Super Bowl champions.

Cooper excused

The Philadelphia Eagles excused Riley Cooper from all team activities after the wide receiver was caught on video making a racial slur. Cooper apologized profusely Wednesday after a video of him using the slur at a Kenny Chesney concert last month surfaced on the Internet. The Eagles immediately fined him.

Cooper is seeking counseling. He said he knows ‘‘there are people who will have a tough time forgiving me for what I’ve done. The best thing for me, and for the team, is to step away for a period of time.’’

Culliver is done

San Francisco 49ers cornerback Chris Culliver will miss the season with a torn ACL in his left knee. Culliver was injured Thursday during a non-contact drill . . . The Oakland Raiders signed kicker Sebastian Janikowski to a four-year extension, ensuring the franchise’s leading scorer will remain with the team through at least 2017. Janikowski is coming off the best season of his career, when he converted 91.2 percent (31 of 34) of his field goal attempts . . . Jacksonville Jaguars defensive end Jeremy Mincey is sidelined with a possible concussion. Coach Gus Bradley said Mincey was seeing a neurologist for more testing . . . Cris Carter is one of seven who will be enshrined into the Pro Football Hall of Fame Saturday along with Jonathan Ogden, Larry Allen, Bill Parcells, Warren Sapp, Dave Robinson and Curley Culp. The only member of the Class of 2013 who didn’t win an NFL title, Carter wiped away tears when asked about his career and the fact it took six tries to get elected. ‘‘The only thing I really wish is we could’ve won that championship for those [Vikings fans],’’ said Carter . . . Arizona nose tackle Dan Williams has a sprained ligament in his right knee and could be sidelined only for a few days. Cardinals coach Bruce Arians said Williams also sprained his right ankle Thursday during the team’s practice, an injury that could wind up being worse than the knee although it is not a high ankle sprain.

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