A hit that cost Chicago Bears safety Chris Conte more than $20,000 could cost the Panthers their No. 2 receiver for Sunday's game at Washington.

Brandon LaFell is listed as doubtful after sustaining a concussion when Conte drilled LaFell in the head with his shoulder on an incomplete pass in the third quarter. Conte was penalized for hitting a defenseless receiver in the head, and was fined $21,000 this week.

LaFell returned to the game after being cleared by the Panthers' medical staff. But he reported post-concussion symptoms Monday, and has not practiced all week.

“We were hoping to get him out (Friday) for a little bit of work. And he didn't work as you would hope to,” Panthers coach Ron Rivera said. “So we'll see how he is (Saturday) and then we'll go from there.”

If LaFell does not play, Louis Murphy and Kealoha Pilares would join Steve Smith in the receiving rotation. Murphy, in his first season with the Panthers, has nine catches for 131 yards, but has dropped several passes.

Pilares has two receptions for 42 yards.

Rivera said the Panthers would activate David Gettis or Joe Adams to fill the last receiving spot if LaFell is ruled out.

Gettis, who missed last season following ACL surgery, resumed practicing last month after starting the season on the physically unable to perform list with a hamstring injury. The Panthers have to activate Gettis by Tuesday or he will be on the PUP list for the remainder of the season.

Adams, a rookie from Arkansas, has been inactive for the past four games after fumbling twice against the Giants in Week 3.

INJURY REPORT: Starting defensive tackle Dwan Edwards did not practice all week after spraining his left foot last week at Chicago. But he worked on the side Friday and is listed as questionable.

“Dwan got out there and did a lot of good work, so I was pretty excited about that,” Rivera said.

Edwards, signed in September after Buffalo released him, has started every game and is third on the team with 4.5 sacks.

The Panthers have several defensive ends who are hurting. Backups Antwan Applewhite (hamstring) and Thomas Keiser (elbow) are doubtful after missing the Chicago game, and rookie Frank Alexander (knee) is questionable.

An MRI on Alexander's knee revealed a bone bruise. He was limited Friday in his first practice of the week.

Linebacker Thomas Davis (knee), center Geoff Hangartner (knee) and tight end Ben Hartsock (ankle) are probable.

MIX AND MATCH: Rivera plans to stick with the more traditional rushing attack the Panthers used against Chicago, but he said the zone read package remains a part of the game plan. With the Panthers using more I-formations and offset-I looks against the Bears, running back Jonathan Stewart carried 17 times for 42 yards.

“I'd like to see it continue right where we were. I thought mixing it in and sprinkling in some of that (zone) read stuff that we did, I thought that was good,” Rivera said. “And depending on how the flow of the game is, you could more of it or you could do less of it. But I liked the mixture that we had.”

The Redskins rank 10th in the league in rushing defense and are last in pass defense, allowing 314.3 passing yards a game.

ROSTER MOVE: The Panthers signed second-year offensive lineman Zack Williams from the practice squad and waived center Thomas Austin, who signed Oct. 11 but did not get in a game. Williams, a sixth-round pick from Washington State in 2011, was on injured reserve last season after tearing the ACL in his left knee during training camp.