Lewis becomes the No. 4 linebacker on the team.
"We're lucky he's still there," Seahawks head coach Jim Mora said about Lewis. "We're lucky he wanted to rejoin us. D.D.'s a guy who a lot of players on this team have a lot of respect for. He's been a captain. So the guys were excited to have him back in the locker room."
Mora said Hill suffered a groin strain and will be out a couple weeks. With Hill out, Herring will get the start at outside backer against the San Francisco 49ers.
"My job as the backup player is to just step in, and we can't miss a beat," Herring said. "We've got 10 other guys that are great defensive players. As a new guy I've just got to go in and do my job."
Tatupu suffered a hamstring injury on Sunday, but Mora said he should be ready to go this week.
--LB Lofa Tatupu is one of three active players joining former players in agreeing to donate their brains after death to a Boston University medical school program that studies sports brain injuries. The other players are Matt Birk of the Baltimore Ravens and Sean Morey of the Arizona Cardinals. The purpose of the study is to help improve the safety of retired and future athletes.
The players' brains and spinal cord tissue will go to the Center for the Study of Traumatic Encephalopathy so researchers can better understand the effects of concussions. More than 150 former athletes, including 40 retired NFL players, already are in the program's brain donation registry.
Tatupu joined the effort when former Seahawks teammate Isaiah Kacyvenski, who also agreed to donate his brain to the study, asked if he would get involved.
--Coach Jim Mora said he let defensive coordinator Gus Bradley handle most of the play calling during the game, offering suggestions when needed.
STRATEGY AND PERSONNEL
--Offensive tackle Damion McIntosh, a 10-year veteran released by Kansas City, will come to Seattle for a visit this week, as the team looks to address its depth on the offensive line.
--Mora said he never considered activating Deion Branch for Sunday's game because his hamstring was not ready, and does not know if Branch will be ready to play next week.
--Backup QB Seneca Wallace got in at quarterback with starter Matt Hasselbeck lining up at receiver. The Seahawks ran a double pass, with Wallace throwing the ball to Hasselbeck behind the line of scrimmage, and Hasselbeck going back to Wallace, who skirted down field for a 24-yard gain. Mora said the team plans to do more of that to keep teams guessing.
--Defensive end Lawrence Jackson is finally living up to his draft status. A first-round pick in 2008, Jackson disappointed in his rookie season, finishing with only two sacks. However, Mora singled Jackson out as one of the players who performed well against the Rams on Sunday. Jackson finished with two tackles and a sack against St. Louis.
REPORT CARD VS. RAMS
PASSING OFFENSE: B-plus -- Matt Hasselbeck threw two picks early in the game, trying to force the ball into coverage. But after that he got on track, finishing 25 of 36 for 279 yards and three touchdowns. Tight end John Carlson had a big game, finishing with six catches for 95 yards and two touchdowns.
RUSHING OFFENSE: B -- Had some struggles initially, but started to break some runs later in the game, including a 62-yard touchdown by Julius Jones, who finished with 117 yards on 19 carries. Overall, the Seahawks rushed for 167 yards on 34 carries for a 4.9 per-carry average.
PASS DEFENSE: B -- Seattle gave up just 170 yards through the air, and finished with three sacks as St. Louis quarterback Marc Bulger was under pressure most of the game. However, late in the contest Bulger did start to connect with Laurent Robinson, who finished with five catches for 87 yards.
RUSH DEFENSE: B-plus -- The Seahawks once again did a good job against St. Louis running back Steven Jackson, holding him to 67 yards on 16 carries. The Seahawks have held Jackson to an average of 76 yards a contest in Jackson's last five games against Seattle.
SPECIAL TEAMS: B -- The Seahawks had a blocked field goal, although the Rams had 12 players on the field at the time and Seattle got the ball back. Jon Ryan had a team-record 70-yard punt, but failed to consistently get the ball inside the 20-yard line on short field punts.
COACHING: A-minus -- Head coach Jim Mora couldn't have asked for a better performance from the Seahawks. Seattle played smart, finishing with only four penalties for 25 yards while the Rams finished with 10 penalties for 85 yards, including four personal foul penalties.