Another player trying to get back for Week 1 is defensive end Ziggy Ansah, who returned to practice Tuesday.

Carroll said that after his first practice, Ansah was "a little sore, just in general, getting the real football moves back going. He's going to stay here over the weekend and work through it, get one day of break, then get right back at it and come back next week on Monday, and we're going. We're counting on him making it through it until we can't."

Three players who are expected to play Thursday night after being out last week are linebacker Shaquem Griffin (knee), quarterback Paxton Lynch (concussion) and safety Marquise Blair (back).

Not available Thursday is backup center Joey Hunt, who sprained his ankle in Saturday's game in Los Angeles. That injury, combined with Ethan Pocic's current role as the No. 1 left guard while Mike Iupati is out, leaves the Seahawks thin at center behind starter Justin Britt. Because of that, veteran Marcus Martin will see playing time at center Thursday. Martin has worked at guard since signing with Seattle in the offseason, but has significant experience at center in his past, including starting for the 49ers there in 2015.

"Marcus is an interesting case," Carroll said. "I think he has 29 starts or something like that as a center, so he's got good background. He's a real big body in there. I'm real anxious to see him play. I've been kind of on his butt all week to make this transition and take advantage of this opportunity with Joey being banged up. He's going to play a lot in this game."

Two offensive linemen who won't be ready for the start of the season are guards Phil Haynes and Jordan Simmons. Carroll said Haynes, who had sports hernia surgery in the offseason, could stay on the physically unable to perform list into the season.

On Haynes, Carroll said. "He's not going to make it to be ready to play by the opener. Being a PUP guy, that's kind of how of how he has a chance to enter (the season). We really wish we could get a shot at him. There's some decisions to be made on that—he could be one of the PUP guys going into the season, he could be on the roster. We really need him right now. With Mike (Iupati) being out, we could have really used him, he could have had a great opportunity in this camp, as Jordan Simmons could have too. It's unfortunate those guys missed."