AP

Seattle Seahawks quarterback Matt Hasselbeck walks off the field at the first day of the team's training camp, Friday, July 25, 2008, in Kirkland, Wash.

RENTON, Wash. - Pro Bowl quarterback Matt Hasselbeck fully participated in a practice Monday for the first time since his back stiffened 10 days ago. He said he will play in the Seahawks' next preseason game Aug. 25 at San Diego.

"It is fine," Hasselbeck said two days after he watched No. 3 quarterback Charlie Frye play all of Seattle's preseason win over Chicago. "If I felt stiff, it's because I was standing around too much the last couple days."

Hasselbeck occasionally stretched and rubbed his back in between practice plays during the team's first full day at its new, $60 million lakeside facility in this south Seattle suburb.

When asked if he would play against the Chargers next week, Hasselbeck said, "Absolutely, (though) I don't know how much."

Coach Mike Holmgren said Hasselbeck gave him "the thumbs up" Monday that he was back to full health.

"He's feeling pretty good ... he'll play," Holmgren said.

The coach also announced that starting right tackle Sean Locklear is out at least two weeks and could miss the Seahawks' opener because of a sprained knee.

"We're hopeful for the first game, but it's going to be close," Holmgren said of the opener Sept. 7 at Buffalo. "It's not an ACL. It's not an operation. It's just rest."

Locklear is wearing a bulky knee brace over a sprained ligament in his left knee. The three-year starter got hurt early in Saturday's game.

Starting center Chris Spencer practiced Monday for the first time this preseason but was held out of team drills while he returns from a lower back injury. He is on track to start the opener, meaning 2007 practice squad player Steve Vallos can go back to being a reserve guard soon.

Pro Bowl defensive end Patrick Kerney participated in a full practice for the second time this summer. He is returning from a strained calf and offseason shoulder surgery.

WHO, ME? Seahawks defensive coordinator John Marshall had a hand in Kyle Orton surpassing Rex Grossman to become Chicago's starting quarterback.

Marshall's unit relentlessly pressured Grossman on Saturday, to the point Grossman had a cut under the bridge of his nose and a bandage over a bruised passing arm. He got the bruise when he was hit by end Darryl Tapp as he threw an interception.

All three Seattle linebackers blitzed unblocked at the doomed Grossman during one play. Nickel back Josh Wilson blitzed in free with a linebacker on another. Grossman was sacked once, hurried many more times and had one intentional-grounding penalty out of self-preservation while completing nine of 15 pass attempts. Many times, he didn't have a chance to find a friendly jersey, let alone set his feet to throw accurately.

On Monday, Marshall just laughed when asked about all the unusual summer blitzing, insisting "we kind of did what we do."

But then he added: "Grossman nailed us a couple times on some throws in other games. I didn't think I wanted to give him that opportunity again. Basically, we were going to make him be good."

Ultimately, he made Grossman be a backup.

Orton entered midway through the second quarter and led Chicago's starters to their only offensive points, a field goal, by using the shotgun formation in a two-minute drill at the end of the first half.

Marshall said he thought Orton was the better Chicago quarterback on Saturday, adding, "I thought he handled the stuff we gave him well."

QUICK HITS: Holmgren said he is still reserving judgment on whether he trusts Frye enough with the offense to let dynamic primary backup Seneca Wallace play receiver and return kicks this season. Frye completed 20 of 35 passes with three interceptions while getting hit and pressured throughout the overtime game Saturday. "He's coming. And I think he's in a much better position now than he was last year to assume a more expansive role," Holmgren said. "But we've got a couple weeks left before we have to really decide." ... Wallace watched practice to rest his sore groin. ... The kicking competition remains close. The Seahawks loved rookie Brandon Coutu's five field goals in five tries Saturday, including the game winner. But Holmgren also loved that veteran Olindo Mare booted two kickoffs deep into the end zone, including one past the back line. "I haven't seen that in a while," Holmgren said, recalling short kickoffs from Josh Brown, who left in the offseason to sign with St. Louis. Special-teams coach Bruce DeHaven said Coutu and Mare would likely split both kickoff and field goal duties at San Diego.