ALAMEDA, Calif. (AP) — Stefen Wisniewski walked slowly through the Raiders locker room, a thick black brace around his right knee. He paused at his stall briefly, donned a black hoodie then moved back out the way he came.
For only the second time in three seasons, Oakland's starting center is facing a Sunday with no football. Wisniewski suffered a knee sprain in last week's loss to the Washington Redskins and hasn't practiced since.
It's another blow to the Raiders offensive line, which could go into Sunday's game against San Diego with only one of its projected starters still in place.
"It's definitely a challenge," said five-time Pro Bowl offensive lineman Andre Gurode, who will start if Wisniewski is unable to play against the Chargers. "You just try to get with everybody, make sure everybody's on the same page and make sure everybody knows what we have to do. That's what we're doing."
Since losing left tackle Jared Veldheer to a triceps injury in training camp, Oakland has scrambled to keep the same unit on the field for longer than a week.
Khalif Barnes, the team's starting right tackle since 2011, has been at left tackle all season after the team tried former first-round pick Alex Barron and rookie Menelik Watson in training camp.
Tony Pashos was signed just before the start of the regular season to replace Barnes at right tackle. Pashos has started all four games but has been limited in practice this week with a groin injury.
Right guard Mike Brisiel is the only player still playing in his original position, while Gurode and Lucas Nix have split time at left guard.
Wisniewski had been one of the few constants as well before injuring his knee. The 48th player taken in the 2011 draft, Wisniewski has played in 35 games in his two-plus seasons with the Raiders. The only other game he missed was the season opener last year.
Although the 6-foot-3, 307-pound center has not practiced this week and is still a longshot to play against the Chargers, the Raiders have not ruled him out.
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