Albert Haynesworth was scheduled to undergo an MRI on his ailing knee on Thursday, head coach Mike Shanahan said.
"His knee has been a little bit sore, more so than it has been in the past," Shanahan said. "In the past, every third or fourth day it would be a little sore, according to the trainers. But now it's consistently sore.
"This was just a preventative measure to see if he's okay. Then we'll go through the rehab work to get him stronger."
Haynesworth missed his eighth day of training camp on Thursday.
Shanahan has required Haynesworth to pass a conditioning test before allowing him to join teammates at practice.
Haynesworth continues to participate in some individual work and he is taking mental reps during practice.
Asked when Haynesworth would be able to take the conditioning test, Shanahan replied: "We'll just wait and see. That's why he gets treatment. He was out there doing individual work and he was a lot further ahead than I thought he would be. It surprised me at how well he did during the drill work. So we'll wait and see."
The goal, Shanahan said, is to make sure Haynesworth is healthy enough to practice and play the entire season.
"If you don't practice throughout the week, you're not going to play well," Shanahan said. "You've got to practice well to play well. That's just what NFL football is all about. Every once in a while, you might get a guy in there that practices a little bit and has a good game, but if you don't practice consistently, it's hard to play consistently.
"That's what I'm after. I'm after him playing well for the whole season...So my job is to make sure that he can play his best once we start our season and that's to get him in football shape. If that knee isn't ready to go, we'll make sure that when it is ready to go, he can go full speed."
Haynesworth has not spoken with the media since rejoining the Redskins for training camp on July 29.
-- FURREY SIDELINED WITH A CONCUSSION
Mike Furrey missed his second day of practice due to a concussion, Mike Shanahan said.
Furrey, who joined the Redskins in early June, had looked promising in the early going of training camp. It's uncertain how much the concussion is going to set him back, though.
"I don't know when he's going to return," Shanahan said. "You don't know with those concussions. He has had one before and so we'll just have to wait and see."
-- BEUERLEIN A COACHING INTERN
Former NFL quarterback Steve Beuerlein is at Redskins training camp serving as a coaching intern. He has been working with the Redskins' quarterbacks.
Beuerlein last played in the NFL with the Mike Shanahan-led Denver Broncos from 2001-03.
He played 15 seasons in the NFL, including stints with the Los Angeles Raiders, Dallas Cowboys, Phoenix/Arizona Cardinals, Jacksonville Jaguars and Carolina Panthers. He threw for 24,000 yards and 147 touchdowns in his career.