Cincinnati Bengals rookie defensive end Shemar Stewart was placed on injured reserve Saturday with a knee injury.

The first-round draft pick (17th overall) missed four games earlier this season with an ankle injury and now must sit out at least four more games.

Stewart, who turned 22 on Wednesday, has recorded six tackles and one quarterback hit in five games (four starts). He has played a total of 177 snaps on defense.

The Bengals (3-6) visit the Pittsburgh Steelers (5-4) on Sunday. Stewart's earliest possible return would be in Week 15 against the visiting Baltimore Ravens on Dec. 14.

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