The Pittsburgh Steelers have placed center Fernando Velasco on injured reserve with a season-ending Achilles injury.
Velasco injured the Achilles in Thursday's 22-20 loss to Baltimore. Velasco is the second center to be lost for the season. Maurkice Pouncey tore the ACL in his right knee eight plays into the opener against Tennessee in September.
The Steelers signed center Eric Olsen and offensive tackle Rashad Butler to add depth to a depleted line. Olsen played in 16 games, with four starts, for the New Orleans Saints in 2012. He was released by the Saints in September. Butler has played in 50 games over the last seven seasons, most recently for the Cleveland Browns.
To make room for Olsen and Butler, the Steelers released cornerback DeMarcus Van Dyke.