Cornerback Tharold Simon will have minor knee surgery this week and seems likely to miss the first month of the season.
Coach Pete Carroll called the problem "minimal" but said now is the time to do it. The Seahawks have a bye in Week 4.
Meanwhile, cornerback Jeremy Lane (hamstring) is probable to play -- meaning the Hawks should have their top nickel defense available.
“You don’t know how much you love something until you can’t do it,” Irvin said. “Coming out here with these guys practicing every day and all I could do was watch. I tried to take the time to try to get better as a linebacker -- that was my first year last year. But man I’m just so happy and excited. Even if I get limited reps Thursday, I’m just excited. … I’m just happy to be dressing out with these boys and feeling like I’m contributing to this win we are about to get.”
Irvin said his hip injury occurred in practice last summer before the first preseason game.
“I just played with it,” said Irvin, who sat out the first four games last season on a suspension and then played in the rest, amassing 40 tackles, two sacks and an interception. “I tried to go again this year but the docs told me if I didn’t get surgery I probably wouldn’t have made it (through the season). I would have probably end up getting surgery during the season. So I had to make a business decision. I’d rather miss four preseason games than four regular season games. I already dealt with that last year. I think I made the right decision, though.”
In other injury news, the Hawks will be without running back Christine Michael (hamstring) on Thursday, and backup center Lemuel Jeanpierre (neck) could be out awhile. Speculation is that the Hawks could make a roster move to replace Jeanpierre. That could mean the return of Caylin Hauptmann. Stephen Schilling becomes the backup center with Jeanpierre out, but the Seahawks are otherwise perilously thin at interior line depth.
Tight end Cooper Helfet (knee) and linebacker Kevin Pierre-Louis (hamstring) also will miss the game.
With Michael out, Robert Turbin will be the only backup tailback to Marshawn Lynch, who Carroll says is in the best shape he has seen him and is ready to "let it rip."
At receiver, rookie Kevin Norwood and Bryan Walters both will be available. Norwood missed the preseason after having foot surgery, and Walters just returned to the team after initially being cut Saturday. It seems unlikely that the Hawks will keep all seven receivers active, though. Norwood probably will be one of the seven inactives.
There is speculation that Walters will platoon with Earl Thomas on punt returns.
Carroll also announced the team captains for 2014, as voted on by teammates: QB Russell Wilson (offense), SS Kam Chancellor (defense) and P Jon Ryan and K Steven Hauschka (special teams). Captains are voted on by teammates.