Neither player has practiced this week. Both were listed as questionable on the injury report Friday.
Gruden is more pessimistic about Riley's chances. Riley sprained the MCL in his left knee in Monday night's loss to Seattle. Clark is nursing two sprained ankles from the same game.
Grudcen said tight end Jordan Reed is "making great progress" from a pulled left hamstring and might play Sunday. Reed was injured in the season opener.
Reed was limited in practice Friday and is listed as questionable.
Meanwhile, Robert Griffin III is expected to miss at least two more games.
Griffin did take part in agility drills at Redskins practice this wee. He appeared to move well as he works his way back from a dislocated ankle in Week 2.
The Redskins are 0-3 without him, dropping to 1-5.
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