The Redskins head into Sunday's game against the Cleveland Browns with a banged-up secondary.
Shawn Springs was added to the injury list on Thursday when he tweaked a calf injury during practice. He headed into the athletic trainer's room at Redskins Park walking with a noticeable limp.
Springs' status will be updated on Friday.
Fred Smoot's groin injury is the most serious concern, Jim Zorn said.
Smoot was limited in practice on Thursday.
"[The groin injury] is coming along," Zorn said. "He may be the most doubtful guy as we work through this.
Carlos Rogers sat out Thursday's practice to rest a calf injury.
"Carlos is going to be okay," Zorn said.
Chris Horton remains sidelined due to an ankle injury. He suffered the injury in last Sunday's game against St. Louis.
The Redskins have already lost Reed Doughty for the season due to a back injury. He was placed on injured reserve this week.
Springs was expected to see playing time at safety in place of Horton.
Now that is a question mark.
"The injuries to the secondary are a real concern," Zorn said. "I really believe that players have to have the example of practicing [before games]. We have some veteran players who can play without practice. But we're getting some younger guys ready, just in case."
If Horton and Springs are unable to play on Sunday against the Browns, then newcomer Mike Green may be forced to start opposite LaRon Landry.
Green, who signed with the Redskins on Tuesday, is an 8-year veteran who has had NFL stints with the Seattle Seahawks and Chicago Bears.
"When we brought him in, I told him he would definitely be inactive the first week and that we'd get him ready the next week," Greg Blache said. "But he may have to be ready to play this week. We'll try to give him a crash course in the basics of the defense. He is an experienced pro. He has been around and he understands our defense."
Green played for Blache when they were both in Chicago from 2000-03.
"If asked to, I can play," Green said. "I'm picking up the defense real fast. It's really the same defense that I ran with Greg in Chicago. Some of the terminology has changed, but it's basically the same defense.
"I'm comfortable with doing what Greg asks me to do. I've been around him for four years and I understand him as a man. That's why coming here is a good fit."
Despite some impressive playmakers like wide receivers Braylon Edwards and Donte Stallworth and tight end Kellen Winslow, Jr., the Browns have the NFL's 28th-ranked offense. They are ranked 26th in passing yards, with an average of 161.0 per game.
Said Blache: "We'll respond to the situation whatever it is and we'll get 11 guys on the field. We'll have a plan going in [to Sunday's game against Cleveland] and we'll execute it."
-- BLACHE REMEMBERS LEWIS
In 2004, the Redskins lost to the Baltimore Ravens 17-10 at FedExField in Week 5.
It was a frustrating loss for Greg Blache because running back Jamal Lewis helped run out the clock on the Redskins in the fourth quarter.
Lewis rushed for 116 yards on 28 carries in that game.
"We played Jamal Lewis and the Ravens beat us because we couldn't get off the field in the 4-minute drill," Blache said. "He was pounding us. He's a difference maker in running the ball."
Lewis moved on to play for the Cleveland Browns prior to the 2007 season,
Lewis, who has more than 9,400 rushing yards, has only faced the Redskins twice in his career.