After missing last week's game against the Dallas Cowboys as he continues to battle pain in his knee, Washington Redskins tackle Trent Williams is questionable for this week's game in Seattle.

This week's injury report is brought to you by Inova, the Official Health System of the Washington Redskins.

The Washington Redskins travel to the West Coast for a Week 9 matchup against the Seattle Seahawks with one offensive lineman, two tight ends and a defensive lineman experiencing a breakout season already ruled out.

Guard Shawn Lauvao (stinger) will be out for this week's game against the NFC West leaders along with second-year defensive lineman Matt Ioannidis (hand) and tight ends Jordan Reed (hamstring) and Niles Paul (concussion).

The Redskins also announced on Saturday that wide receiver Jamison Crowder (hamstring) has been downgraded to out.

Tackles Trent Williams (knee) and Ty Nsekhe (core muscle) and center Spencer Long (knees) are doubtful to play while guard Brandon Scherff (knee), cornerback Bashaud Breeland (knee/groin), running back Rob Kelley (ankle), safety Montae Nicholson (shoulders) and linebacker Martrell Spaight (shoulder) are questionable for the game.

With Long listed as doubtful, the Redskins could call on rookie sixth-round pick Chase Roullier to start at center once again. In his first career start against the Dallas Cowboys last Sunday, the University of Wyoming product played all 59 snaps.

Washington will be without two of their top three tight ends, as both Reed and Paul suffered their injuries in the first half against Dallas. Without the two veterans, the Redskins will look to Vernon Davis and Jeremy Sprinkle to take over the load at the position.

Davis, of course, continues to be one of the NFL's most productive tight ends, as the 12-year veteran out of the University of Maryland has recorded 17 receptions for 312 yards and one touchdown so far this season. His 18.4 yards per reception is best among all players in the NFL right now.

Sprinkle, meanwhile, has appeared in two games during his debut campaign but has yet to record a catch. With the Redskins having success with two-tight end packages this season, the rookie out of Arkansas could see an increase in playing time on Sunday.

"Just throughout the year, I've always been prepared and just really waiting for my moment," Sprinkle said. "Now throughout practices, I've been showing the coaches what I can do other there and I think they feel comfortable with me out there. Now it's just go out there and perform."

After having his best game of the season, Crowder is among those listed as questionable. The third-year Duke product tied a career-high with nine catches for 123 yards against the Cowboys. But he did not practice this week as Redskins head coach Jay Gruden admitted he's "concerned" about the wide receiver's prospects of playing against Seattle.

As for Ioannidis, the second-year Temple product has been one of the most consistent players for the Redskins to date this season, recording 14 tackles with 3.5 sacks and his first career forced fumble off Ezekiel Elliott last Sunday.

While Ioannidis had a procedure this week on his fractured hand, there's hope that he can return as early as Week 10 against the Minnesota Vikings.

"We'll see if we can cast that thing up and if he can play with a cast – how soon that'll be," Gruden said. "That'll be up to the doctors and Matt, how comfortable he feels with that thing casted. But there's been a lot of players that have played with a cast on their hand and been effective. But everybody's different, we'll see how it goes."

Scherff could return to action this week after being inactive against the Cowboys as he suffered an MCL sprain in Washington's Week 7 loss to the Philadelphia Eagles.

It was the first time Scherff did not play a regular season game since being drafted in the first round of the 2015 NFL Draft. 

Having Scherff back on the field would be a "big deal," particularly for a unit that's faced mounting injury issues over the last few weeks.  

"He is a very good offensive lineman," Gruden said. "So anytime you get a chance to get a Pro Bowler back in your lineup, then it's a big deal."

As for Williams, the five-time Pro Bowler sat last week hoping that rest while ease the pain of a knee cap injury that resurfaced last month. He has spoken with multiple doctors now about the impacts of both playing again this season and going ahead and getting surgery.

"Some say that you can do it right now and go ahead and be ready for next year, but the majority says that with a few weeks rest, you can give that bone bruise area time to chill and kind of recover and then you won't feel that instability that you feel," Williams said. "Obviously, the knee cap is going to float around, there's really nothing you can do at this point, but when you strengthen all of the areas around it, you take the chance of your leg buckling and you put all your major ligaments at risk. That's the scary part."