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Updated: September 19th, 2012 3:49pm
Vikings linebacker Erin Henderson sits out practice with a concussion

Vikings linebacker Erin Henderson sits out practice with a concussion

by Tom Pelissero
1500ESPN.com
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EDEN PRAIRIE, Minn. -- Linebacker Erin Henderson's status for the Minnesota Vikings' game against San Francisco on Sunday may be up in the air because of a concussion.

Coach Leslie Frazier said on Wednesday morning that everyone on the roster was expected to practice in the afternoon. But the official injury report listed Henderson as a non-participant.

Henderson, who leads the Vikings with 26 tackles (20 solo) and two sacks, departed Sunday's loss at Indianapolis in the fourth quarter. It appeared doctors were checking him for a concussion, but Henderson returned to action and Frazier said after the game it was believed to be an elbow issue.

Tyrone McKenzie replaced Henderson at weakside linebacker in the base defense and could be an option to start there on Sunday. Marvin Mitchell was Henderson's primary backup throughout the preseason but has been inactive the past two weeks because of an ankle sprain.

Starting middle linebacker Jasper Brinkley replaced Henderson in the nickel. But the Vikings may be reluctant to play him there for a whole game if Henderson can't go.

The only other player missing part of Wednesday's practice was center John Sullivan, who has been battling an ankle injury and was listed as a limited participant.

Safety Andrew Sendejo (ankle), cornerback Chris Cook (biceps), tight end Rhett Ellison (ankle), Mitchell, end Brian Robison (elbow) and receiver Jarius Wright (ankle) were full participants.

In San Francisco, the only player sitting out altogether was running back Brandon Jacobs (knee). Receiver Ted Ginn Jr. (ankle) was limited and punter Andy Lee (hand) was a full participant.

Tom Pelissero is Senior Editor and columnist for 1500ESPN.com. He hosts from 6 to 8 p.m. weeknights and co-hosts from 10 a.m. to noon Sundays on 1500 ESPN Twin Cities.
Email Tom | @TomPelissero | Tom Pelissero
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