San Francisco 49ers

49ers injuries: Anthony Davis to miss second game with concussion

SANTA CLARA -- Jonathan Martin will make his second straight start at right tackle after Anthony Davis officially was declared out of Thursday’s showdown with the Seahawks. Davis suffered a concussion at the end of the team’s Week 11 win against the Giants and still was experiencing symptoms this week.

For Martin, it’s familiar territory. He’ll make his seventh start of the season against a Seahawks defense that ranks fourth in the NFL against the pass but has only 16 sacks (29th) this season. Against Washington on Sunday, Martin allowed a sack and two hurries.

Also out for the 49ers are nose tackle Glenn Dorsey (arm) and tight end Derek Carrier (foot). Quinton Dial will start at nose tackle against Seattle’s top-ranked rushing attack while Vernon Davis and Vance McDonald could be the only healthy tight ends. McDonald, who missed the Washington game, is listed as questionable with a back injury.

Defensive ends Ray McDonald (knee) and Justin Smith (back) are listed as probable. Smith did not practice in the short run-up to Thursday’s game. Cornerback Tramaine Brock (hamstring) is listed as questionable but did not practice this week and is unlikely to be on hand for the Seahawks game.

49ers

Out: TE Derek Carrier (foot), T Anthony Davis (concussion), DT Glenn Dorsey (forearm)

Questionable: CB Tramaine Brock (hamstring),, WR Bruce Ellington (ankle), TE Vance McDonald (back)

Probable: RB Frank Gore (knee), WR Brandon Lloyd (quadricep), DE Ray McDonald (knee), RB Bruce Miller (shoulder), S Eric Reid (ankle), DE Justin Smith (back) S Raymond Ventrone (groin)

Read Matt Barrows’ blogs and archives at www.sacbee.com/sf49ers.

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