Vikings' Erin Henderson out; Christian Ponder, Kyle Rudolph probable
Get the 1500 ESPN SportsWire delivered to your inbox daily, and keep up with all the news in Twin Cities Sports
EDEN PRAIRIE, Minn. -- Erin Henderson missed a sixth consecutive practice on Friday, and the Minnesota Vikings ruled out their starting weakside linebacker for Sunday's game at Detroit.
Henderson led the Vikings with 26 tackles (20 solo), two sacks and four tackles for loss through two games. But he reported concussion symptoms on Sept. 19 and hasn't been on the field since.
As recently as Thursday afternoon, coach Leslie Frazier had said he had his fingers crossed Henderson could pass through the NFL's concussion protocol in time to play.
"He's pretty far into it," Frazier said on Friday. "It's just (Friday) he still wasn't able to pass the test that they gave him. So, you'll have to wait a little bit longer."
The Vikings generally have had players miss one game after concussions in recent years, although there have been exceptions such as quarterback Christian Ponder, who played eight days after he suffered one on Dec. 24 at Washington.
That Henderson will miss at least two games would seem to raise the level of concern at a time the NFL is emphasizing caution when it comes to head injuries.
"Anytime it's a concussion, you get a little concerned," Frazier said. "He's had two other concussions. You just hope that things will be a little bit better next week, and we'll see."
Frazier said he wasn't sure if the fact Henderson's concussion wasn't diagnosed until three days after the game had an impact on the linebacker's recovery time.
Asked if Henderson has experienced any effects in his day-to-day life, Frazier said, "I think it's more football, because he hasn't mentioned that part of it. It's more just the tests that they're giving him, he hasn't been able to pass them, whether it be computer tests or some of the other things they're doing. But he hasn't complained about light or movement."
Henderson's contract has $234,375 tied up in per-game roster bonuses, meaning he will lose another $15,625 by being inactive this week.
The only other player missing from Friday's practice was safety Mistral Raymond, who dislocated his right ankle in last weekend's win over San Francisco and is expected to miss three to five weeks. He also was ruled out.
Safety Andrew Sendejo (ankle) returned to practice on a limited basis on Friday after sitting out Thursday and was listed as questionable (50% chance of playing). So was end D'Aundre Reed (calf), who was upgraded to full participation on Friday.
Quarterback Christian Ponder (neck), tight end Kyle Rudolph (quadriceps), end Jared Allen (neck) and linebacker Marvin Mitchell (ankle), who is slated to start in Henderson's place again, all were full participants on Friday and listed as probable (virtual certainty of playing).
As expected, the Lions ruled out defensive tackle Corey Williams, who underwent knee surgery earlier in the week. Another starter, free safety Louis Delmas (knee), is listed as doubtful (25% chance of playing), as is backup linebacker Travis Lewis (quadriceps).
Two more starters -- linebacker Justin Durant (back) and halfback Mikel Leshoure (groin) -- are questionable, as are backup safety Amari Spievey (groin) and tight end Tony Scheffler (calf).
Quarterback Matthew Stafford (hip) was a full participant in Friday's practice and is probable. So are receivers Calvin Johnson (ankle) and Titus Young (knee), end Lawrence Jackson (calf), tackle Corey Hilliard (elbow) and guard Rob Sims (knee).