Seattle Seahawks center Max Unger left Sunday's game against the Tampa Bay Buccaneers with a concussion.
Unger, an All-Pro in 2012, was one of three starting offensive linemen to miss at least one game in the first eight weeks of the season. He was replaced Sunday by Lemuel Jeanpierre.
The Seahawks continue to play without starting offensive tackles Russell Okung and Breno Giacomini.
Giacomini's replacement at right tackle, rookie seventh-round pick Michael Bowie, was out of the game briefly with a knee injury but returned in the third quarter.