ST. LOUIS -- As expected, the Seattle Seahawks placed rookie defensive end Cassius Marsh on injured reserve Saturday and brought up two players off the practice squad -- cornerback Steven Terrell and rookie tight end RaShaun Allen.

Marsh suffered a broken foot in practice Wednesday and will undergo surgery that will take six to eight weeks to recover, but placing Marsh on IR has ended his season.

Terrell played in his first NFL game last weekend in the 30-23 loss to the Dallas Cowboys, coming in at nickel cornerback after Byron Maxwell injured his calf. Marcus Burley moved from nickel back to Maxwell’s cornerback spot. Maxwell will not play Sunday against the St. Louis Rams.

The Seahawks added Allen because starting tight end Zach Miller is out after undergoing ankle surgery and backup tight end Luke Willson is questionable with a groin injury. Allen (6-foot-4, 250 pounds out of Southern University) will be playing in his first NFL game.

Five Seahawks on the 53-man roster are out for Sunday’s game -- Maxwell, Miller, center Max Unger, middle linebacker Bobby Wagner and defensive tackle Jordan Hill.