McKissic (concussion) didn't participate in Thursday's practice, John Keim of ESPN.com reports.

McKissic looked to be advancing through the concussion protocol last week after he managed limited practices Thursday and Friday before being ruled out in advance of Washington's 27-20 loss to Dallas, but the running back appears to have since suffered a setback. He's now been listed as a non-participant in two straight practices, which suggests his absence from Wednesday's session wasn't merely a maintenance day. Even if he gets back on the field as a limited participant Friday, McKissic will still need to get the green light to take contact in addition to gaining clearance from an independent neurologist in order to play Sunday in Philadelphia. Given the multiple obstacles in his way, McKissic appears likely to sit out a third consecutive game.

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