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NFL notebook: Panthers DE Johnson suspended for PED use

Carolina Panthers defensive end Charles Johnson was suspended four games for violating the league's policy on performance-enhancing substances, the NFL announced Friday.

Johnson will begin his suspension immediately and miss Sunday's key NFL South battle against the New Orleans Saints, who are tied with the Panthers at 8-3.

Johnson will be eligible to return to the Panthers' active roster on Dec. 25 and available to play in the final regular-season game against the Atlanta Falcons on Dec. 31. He started all 11 games this season, making 16 tackles and no sacks.

"I accept full responsibility," Johnson said in a statement released by the team. "I have been recovering from back surgery, dealing with the daily grind of football and mistakenly thought this could help. It was an error in judgment on my part. We have a special group here I wanted to be a part of and felt an obligation to do my part by getting back as soon as possible."

The 31-year-old Johnson re-signed with the Panthers prior to this season on a two-year deal worth $9.5 million. He has 67.5 career sacks, second on the team's all-time list.

--Green Bay Packers running back Ty Montgomery was placed on injured reserve and will soon undergo season-ending wrist surgery.

Montgomery has been bothered by wrist soreness throughout the campaign. He is expected to be recovered from surgery before the team's offseason conditioning program beings.

Montgomery rushed for 273 yards and three touchdowns on 71 carries this season. He also caught 23 passes for 173 yards and one score.

Cornerback Kevin King (shoulder) was ruled out for Sunday's game against the Tampa Bay Buccaneers. Listed as questionable are linebackers Clay Matthews (groin) and Ahmad Brooks (back), defensive tackle Kenny Clark (ankle), running back Aaron Jones (knee) and guard Lucas Patrick (hand).

--The Arizona Cardinals signed defensive tackle Corey Peters to a three-year contract extension through the 2020 season, the team announced.

Peters, 29, was in the final year of a three-year deal signed in 2015.

The 6-foot-3, 305-pound Peters has been with the Cardinals the past three seasons after joining the team as a free agent in 2015. After missing his first year in Arizona with a torn Achilles, the nose tackle has 38 total tackles and one sack in 24 games played over the past two seasons.

--The Denver Broncos promoted cornerback Marcus Rios to the active roster from the practice squad.

The 5-foot-11, 185-pound Rios is a rookie from UCLA who has competed on Denver's practice squad during the entire 2017 season. He entered the NFL with Denver as a college free agent on May 11.