RENTON, Wash. (AP) -- J.R. Sweezy was the one part of the Seattle Seahawks offensive line that had avoided injuries or having to change positions this season.
Not anymore. Not after a concussion suffered last Sunday against the New York Giants surfaced earlier this week and will keep him out of Sunday's game against Arizona, during which the Seahawks have a chance to wrap up the NFC West title and home-field advantage for the playoffs.
Sweezy was not listed on Seattle's injury report on Wednesday, but missed practices on Thursday and Friday and was not cleared, coach Pete Carroll said.
''It happened in the game. We didn't realize that it was an issue until afterward,'' Carroll said.
This will be the first missed game of the season for Sweezy, who has been the one constant on the Seahawks offensive line. While center Max Unger, right tackle Breno Giacomini and left tackle Russell Okung have all been sidelined by injuries, Sweezy has started 18 straight regular and postseason games dating back to last season.
The loss of Sweezy leaves a big question on Seattle's offensive line and one Carroll playfully chose not to answer on Friday. Seattle could use one of its rookies - Alvin Bailey or Michael Bowie - to play at the position or possibly slide left guard Paul McQuistan to the right side and play James Carpenter at left guard. McQuistan and Carpenter have been rotating at left guard the past few weeks.
Bowie started seven games earlier in the season at right tackle when Giacomini was out with a knee injury. Bailey has played as a substitute in 12 of 14 games.
Whoever gets the nod in Sweezy's place, Carroll was not about to reveal any decisions.
''We'll have to wait and find out,'' Carroll said.
Cornerback Jeremy Lane returned to practice on Friday after missing Thursday with an ankle injury. He's listed as probable, along with backup running back Robert Turbin, who also missed practice on Thursday. Lane has been serving as the Seahawks' fifth cornerback in passing situations with Walter Thurmond (suspension) and Brandon Browner (injury/suspension) both out.
Seattle will also be without Percy Harvin, missing his fourth straight game after making his season debut in Week 11 against Minnesota.