PITTSBURGH -- The Steelers ' task of slowing tight end Tyler Warren and the juggernaut Indianapolis Colts offense just got even more difficult.

Hours after officially placing safety DeShon Elliott on injured reserve with a hyperextended knee, the Steelers ruled safety Jabrill Peppers out with a quad injury.

Peppers, a former member of the New England Patriots who was signed by the Steelers earlier this season after Elliott's Week 1 knee injury, first appeared on the injury report as a limited participant in Thursday's practice and didn't practice on Friday.

The Steelers also listed safety Chuck Clark as questionable with an illness for Sunday's game. Clark took some of Elliott's responsibilities in accounting for Packers tight end Tucker Kraft in the loss to the Packer

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