SEATTLE – Glenn Dorsey’s potential season-ending knee injury opened the door for 49ers rookie defensive lineman Arik Armstead to see his most action of the season.
Armstead, the 49ers’ first-round draft pick, played a season-high 46 snaps on defense, including his first playing time of the season in the team’s base defense. Armstead will likely see an increase in playing time with Dorsey out of action.
“I want to be a complete defensive lineman, not just a pass-rusher,” Armstead said Sunday, following the 49ers’ 29-13 loss to the Seattle Seahawks. “I want to play base and the sub packages. And the more you play, the better you get.
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“I hope everything is OK with Glenn. But if he’s down, our D-line has to step up, including me. I have to step up and make plays to help our team win.”
Armstead was credited with six tackles and one quarterback hurry. But the 49ers’ defense, as a whole, had an awful time against Seahawks rookie running back Thomas Rawls and quarterback Russell Wilson.
[MAIOCCO: Rookie Rawls rolls to record day through 49ers' defense]
Rawls became the first 49ers opponent in club history to eclipse 200 yards rushing with his 30-carry, 209-yard performance. And Wilson completed 24 of 29 passes for 260 yards and three touchdowns.
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Dorsey is scheduled for an MRI on his right knee on Monday at Stanford. His knee buckled when he was engaged with Seahawks right tackle Garry Gilliam on a running play on the 49ers’ first defensive snap of the game. The 49ers fear Dorsey sustained a season-ending injury.
Marcus Cromartie replaced starting right cornerback Kenneth Acker and played the entire second half. On offense, right guard Andrew Tiller got his first career start and played every snap. Tiller replaced Jordan Devey in the 49ers' starting lineup.
Here’s a complete rundown of the 49ers’ play time on offense, defense and special teams:
Offense
(53 snaps)
53 -- QB Blaine Gabbert, LT Joe Staley, LG Alex Boone, C Marcus Martin, RG Andrew Tiller, RT Erik Pears
48 -- RB Shaun Draughn
45 -- WR Torrey Smith
44 -- TE Vance McDonald
43 -- WR Anquan Boldin
31 -- TE Garrett Celek
20 -- WR Quinton Patton
15 -- FB Bruce Miller
12 -- WR Bruce Ellington
4 -- TE Blake Bell
3 -- RB Travaris Cadet
Defense
(78 snaps)
78 -- FS Eric Reid, CB Tramaine Brock, LB NaVorro Bowman
75 -- SS Jaquiski Tartt
65 -- OLB Aaron Lynch
62 -- DL Quinton Dial
58 -- OLB Ahmad Brooks
57 -- Michael Wilhoite
47 -- CB Marcus Cromartie
46 -- NT Ian Williams, DT Arik Armstead
45 -- DB Jimmie Ward
31 -- CB Kenneth Acker
21 -- NT Mike Purcell, OLB Eli Harold
16 -- DL Tony Jerod-Eddie
12 -- OLB Corey Lemonier
11 -- LB Gerald Hodges
10 -- CB Dontae Johnson
1 -- DL Glenn Dorsey
Special teams
26 -- Nick Bellore, Shayne Skov
21 -- Kendall Gaskins, Miller, Johnson
20 -- Ward
18 -- Patton
15 -- Acker
14 -- Bradley Pinion
12 -- Cromartie
10-- Kyle Nelson, Ellington
9 -- McDonald, Jerod-Eddie
8 -- Dial, Harold
7 -- Celek, Hodges
5 -- Reid, Brock, Tartt, Wilhoite, Williams, Purcell
4 -- Chris Davis, Lynch, Armstead
3 -- Phil Dawson, Jordan Devey, Pears, Boone, Tiller
Did not play -- QB Dylan Thompson, OT Trent Brown
Not active -- WR Jerome Simpson, WR DeAndrew White, CB Keith Reaser, RB Carlos Hyde, OL Brandon Thomas, OL Ian Silberman, DL Tank Carradine