Jon Jansen sat out practice on Wednesday, but he said he expects to test his sprained knee sometime this week.
That will be the determining factor whether he'll be available to play in this Sunday's game against the Cincinnati Bengals.
"I'm going to get more treatment and then get out there to see how it feels," Jansen said. "Until I get out there, it's hard for me to gauge right now. It's stiff. It had some swelling and bruising. I'm playing it day to day."
Jansen suffered the injury in the first half of last Sunday's game against the Baltimore Ravens.
Jim Zorn said that how Jansen is able to set his feet would be the key to his availability on Sunday.
"He is going to work hard to try to get going, but big guys really have to set a great anchor," Zorn said. "I'm not going to try to manipulate him psychologically and say, 'Jansen, we really need you. You have to play.' He has to tell me whether he can go or not.
"And he is going to have to prove it out here by being able to anchor and go through some drills pushing hard. If he can't, then we have to go on to the next guy."
If Jansen is unable to play, then Jason Fabini is expected to start in his place at right tackle.
Fabini, in his second season in Washington, has started at left and right tackle the bulk of his 11-year NFL career. He played mostly guard last year for the Redskins.
Jansen has noted improvement in his knee since suffering the injury last Sunday.
He is eager to play and finish the regular season strong.
"We only have three weeks left, and I'm not saving it for anything," Jansen said. "I have to gauge whether I'm putting myself or other individuals at risk, but if I can help us in any way, I'm going to be out there."
-- LONG INJURY LIST AGAIN
The Redskins rested 10 starters for Wednesday's practice, including seven on defense, as the team continues to struggle through injuries.
On defense, Cornelius Griffin (shoulder/abdomen), Kedric Golston (ankle), London Fletcher (foot), Marcus Washington (ankle), Chris Horton (shoulder), Carlos Rogers (illness) and Shawn Springs (calf) sat out practice.
Jim Zorn was optimistic that the team would have Horton available for Sunday's game. Horton suffered the injury midway through the Ravens game.
Regarding Washington, Zorn said that he's still not ready to return from his high ankle sprain.
"I believe we'll have him next week for the last two games of our season," Zorn said.
It was thought that Golston's status was improving, but he missed the Ravens game and he continued to sit out practice to rest bone spurs in his ankle.
Springs's status is also uncertain as he continues to struggle with a calf injury that has sidelined him for seven games this season.
On offense, Pete Kendall (knee) and Randy Thomas (knee) joined Jon Jansen on the sidelines. Both have taken practices off to rest sore knees, but they are expected to play vs. Cincinnati this Sunday.
Todd Yoder also sat out practice with a knee injury suffered in the Ravens game.
-- LEWIS AND TWO EX-REDSKINS
Cincinnati head coach Marvin Lewis picked up two former Redskins in recent months.
First the Bengals signed quarterback Jordan Palmer, the Redskins' sixth-round draft pick in 2007. He is the brother of Bengals quarterback Carson Palmer, who is out with an elbow injury.
Then they signed offensive lineman Andrew Crummey, a Maryland product, off the Redskins' practice squad.
On Palmer, Lewis said: "Jordan is his own man. Other than sharing the same last name, [Jordan and Carson] are really a little bit different in personality. Jordan has been very hard-working like Carson. It's a good situation for the both of them,"
On Crummey, Lewis said: "We had him working at center and we're trying to get him accustomed to doing that. He played a little bit with the Redskins at center in preseason, but that was his first exposure to it. Obviously it's a new system and a new position, so we're trying to get him up to speed.
"He takes a lot of snaps in practice and a few snaps in the games. We'll continue to work him in and get him up and running. I think he has a good future in the NFL."