Redskins cornerback David Amerson, shown here upending Eagles wide receiver Riley Cooper in Week 3, left Sunday’s game with a concussion. (Jonathan Newton/The Washington Post)

The Washington Redskins‘ ranks in the secondary continued to thin in Sunday’s 30-20 loss to the Arizona Cardinals, as David Amerson left with a concussion and did not re-enter the game. The second-year cornerback is set to go through the league-mandated concussion protocol Tuesday, and Coach Jay Gruden said his status is day-to-day.

The Redskins already are without starting cornerback DeAngelo Hall, who is out for the season with a ruptured Achilles’ tendon. Safety Brandon Meriweather also left Sunday’s game to be monitored for concussion-like symptoms but was able to come back. Safety Ryan Clark, meanwhile, aggravated an ankle sprain that kept him out of practice last week and will be limited in practice this week, Gruden said.

With a depleted secondary and little in the way of a pass rush, the Redskins labored against Arizona’s passing game. Cardinals quarterback Carson Palmer, 34, was uncertain to start until well into the weekend but completed 28 of 44 passes for 250 yards and two touchdowns without an interception.

The Redskins also played without starting linebacker Perry Riley Jr., who is listed as day-to-day with a sprained medial collateral ligament in his left knee. Will Compton started in Riley’s place.

Other notable players Gruden said would be limited in practice include left tackle Trent Williams (knee), linebacker Brian Orakpo (ankle), linebacker Akeem Jordan (knee) and safety Trenton Robinson (ankle).

E-mail a Redskins question to mike.jones@washpost.com, with the subject line “Mailbag question,” and it might be answered in Tuesday’s Mailbag.

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