Vikings backup suspended

Minnesota Vikings backup linebacker Erin Henderson was suspended for four games for violating the NFL's policy on performance-enhancing substances.

The suspension covers Minnesota’s final three regular-season games and first playoff game. The NFL does not specify the substances for which players test positive.

The Vikings were off Tuesday and unavailable for comment.

Henderson is the younger brother of fellow Vikings linebacker E.J. Henderson, who broke his left leg Dec. 6 and is out indefinitely.

Erin Henderson has been active for two games this season, including Sunday’s win over Cincinnati. He has played primarily on special teams.

Fitzgerald’s knee sprained

All-Pro receiver Larry Fitzgerald has a bruised bone and a sprained right knee, leaving his status uncertain for Arizona’s game Sunday at Detroit.

Fitzgerald was hurt on the third play of the third quarter of Monday night’s game at San Francisco when the 49ers’ Dashon Goldson landed on his leg on a deep pass attempt. Fitzgerald was helped off the field, then went to the locker room. He returned to the game with 3:23 to play.

Extra points

Carolina placed right tackle Jeff Otah (torn left meniscus) on injured reserve and signed offensive lineman Rob Petitti. Otah is the 10th Panther to go on IR this season. ... Richie Incognito was released by the Rams, two days after coach Steve Spagnuolo benched the temperamental offensive guard for the second half of a loss at Tennessee. He was named the dirtiest player in the NFL earlier this year by The Sporting News. ... The NFL determined it “cannot conclude” that the Redskins committed a tampering violation before signing defensive tackle Albert Haynesworth last offseason. ... Cowboys linebacker DeMarcus Ware said his sprained neck felt “100 percent better” but he did not practice and will undergo more tests before the team decides whether he will be available to face New Orleans on Saturday. ... Embattled Falcons defensive tackle Jonathan Babineaux, younger brother of Seahawks safety Jordan Babineaux, was smoking marijuana as he and a friend were driving through the northeast Atlanta suburbs, according to a police report. Police said they found about 11/2 ounces of marijuana in Babineaux’s car last week. ... Steelers left guard Chris Kemoeatu will sit out Sunday’s game against Green Bay with right wrist and right knee injuries.