Redskins receiver Paul Richardson missed practice on Thursday as he sought more doctors' opinions on his injured shoulder. (Patrick Semansky/AP)

Once again, the Redskins will go into a game with several of their key playmakers in serious doubt of playing. Starting wide receivers Jamison Crowder and Paul Richardson missed practice on Thursday, raising concern they might not be able to play Sunday afternoon when the Dallas Cowboys visit FedEx Field.

Crowder, who missed last week’s game with an ankle injury, was in the locker room on Thursday with his foot in a boot and his knee resting on a walking scooter.

Richardson missed practice to see a doctor for a second opinion on a knee injury suffered against the New Orleans Saints in Week 5. He also has been playing through a shoulder injury that has lingered for most of the season.

“Paul’s a tough guy,” Coach Jay Gruden said, adding that the doctor’s visit was more to be sure Richardson didn’t aggravate the injury more by playing. “He’s still very fast. If he can deal with it great and hopefully it will subside a little bit tomorrow and get positive report today and everything’s fine. We’re being a little cautious now. It’s an issue of pain tolerance.”

Running back Chris Thompson, who missed last Sunday’s game with a rib injury, practiced on a limited basis on Wednesday, though most of his work was in individual position drills and not with the whole team. Gruden said he hoped to have a better feel on Friday about whether Thompson will be able to play this weekend.

Guard Shawn Lauvao practiced on Thursday, and Gruden said he might be able to play Sunday. Lauvao has missed the last three games with a calf injury. Gruden added that Lauvao will have to practice on Friday to be able to play against Dallas.

Safety Troy Apke missed practice again with a pulled hamstring.

Other Redskins players on the injury report are guard Brandon Sherff (knee), running back Adrian Peterson (ankle and shoulder) and cornerback Danny Johnson (broken arm). All were limited in Thursday’s practice.

The Redskins also promoted wide receiver Jehu Chesson from the practice squad. Chesson will take the roster spot of veteran defensive lineman Ziggy Hood, who released earlier this week.

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