Packers cornerback Sam Shields is helped off of the field after taking a hit to the head against the Dallas Cowboys at Lambeau Field. Credit: Getty Images

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Green Bay — Cornerback Sam Shields remained in the evaluation process Friday morning because of a concussion and almost certainly won't be in uniform Sunday when the Green Bay Packers meet the Washington Redskins in an NFC wild-card playoff game at FedEx Field.

"When you're talking about a concussion it's obviously different than other injuries," Packers coach Mike McCarthy said Friday morning. "You don't just get to 70, 80, 90%. Every one is different. Every player is different. Until he comes through the protocol that's just where we are."

Last week, Shields was able to take part in practice on Wednesday and Thursday, although he was not cleared from the concussion protocol and did not play against the Minnesota Vikings.

Shields suffered the head injury in the first half against the Dallas Cowboys on Dec. 13.