Ed Szczepanski-USA TODAY Sports

49ers linebacker Ahmad Brooks has entered the concussion protocol

Ahmad Brooks came into the 49ers' facility this week with headaches, their coach said.

SANTA CLARA, Calif. - After playing 58 snaps Sunday in Seattle, 49ers outside linebacker Ahmad Brooks came to the team's facility with headaches and has been placed in the NFL's concussion protocol, head coach Jim Tomsula said on Wednesday.

"He wasn’t feeling good...(we) got to monitor that. We wanted to make sure we’re on the same side there," Tomsula said.

Brooks finished with three tackles and his fourth sack of the season in the 29-13 loss, and said after the game he thought he started the game slowly as the defense allowed touchdowns in the Seahawks' first three possessions.

"It took me a while for me to get up and get going in this game today," Brooks said Sunday. "We can’t do that if we want to be something special. We want to improve what we’re doing. We got to come out like our ass is on fire.

"I just think that you play in Seattle, there’s something about playing here. For me, especially," Brooks said. "The past couple years, when we come here it’s either in November or December. It’s always dark, gloomy, you know? There’s just something about playing here. It seems like guys are dropping like flies. That says a lot about both teams. We both play physical. Just got to keep fighting, man."

Seattle amassed a season-best 508 yards of offense against San Francisco after defensive tackle Glenn Dorsey suffered a torn anterior cruciate ligament on the first place from scrimmage.

Tomsula said Dorsey had successful surgery to repair his ACL Tuesday at Stanford hospital and will be placed on injured reserve, although that move is still pending.

The 49ers could use that vacant roster spot on center Daniel Kilgore, who had his 21-day practice window opened last week.

"Not this week (against Seattle), maybe next week," Kilgore said leading up to Sunday's game. "Again, we’ll go out there and see how it feels. I’ve said this before. The biggest thing for me would be the conditioning part. My ankle, leg, it all feels stable. And we’ll go out there and test it out and see how bad out of shape I really am."

Tomsula said Kilgore's practice work was encouraging. He took the majority of snaps with the scout team and was worked into the fold with the offense.

"I thought (Kilgore) did really good," Tomsula said.

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Chris Biderman is the Editor-in-Chief of Niners Digest and covers the 49ers from their headquarters in Santa Clara. Chris has been writing about the team since the spring of 2013. The Ohio State alum received his Journalism degree in 2011 and has been working in sports media since 2008. Chris, a Santa Rosa, Calif. native, is also a contributor to the Associated Press covering sports throughout the Bay Area. You can follow Chris on Twitter here.

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