The Steelers placed center
The Steelers signed Velasco on September 9, 2013, when center
Van Dyke was signed on November 5, 2013. Earlier this season, he was placed on the team’s Waived/Injured List on August 25. Van Dyke was originally drafted by the Raiders in the third round (87th overall) of the 2011 NFL Draft.
Butler (6-4, 310) has played in 50 games with four career starts. He was released by the Cleveland Browns on November 5, 2013. He spent time with the Houston Texans from 2007-11. He was originally drafted by the Carolina Panthers in the third round (89th overall) of the 2006 NFL Draft.
Olsen (6-3, 305) has played in 17 games with four starts. He was released by the New Orleans Saints on September 9, 2013. Olsen originally was drafted in the sixth round (183rd overall) of the 2010 NFL Draft.