Lewis (6-1, 310) was with the Seahawks briefly in the preseason when he was claimed off waivers from the Jacksonville Jaguars. Seattle waived cornerback Josh Thomas to make room for Lewis, who played college football at Texas A&M.
The Seahawks needed another center on the roster with Unger nursing an injury. If he doesn't Sunday against the Dallas Cowboys, Stephen Schilling will start at center for the Seahawks. Schilling has never started an NFL game at center and had never played the position in a game until Monday night for a few plays in the fourth quarter when Unger suffered his foot injury.
Schilling, who played college football at Michigan, grew up in Bellevue, Washington, the other side of Lake Washington from downtown Seattle.
"I don't know what's going to happen, but it would be really cool," Schilling said of the possibility of starting Sunday at CenturyLink Field. "It's already so cool just to be here. I've mostly been a guard in my career. You're definitely more involved at center, making the line calls and touching the ball every play."