The Steelers are meeting with free-agent defensive tackle Anthony "Booger" McFarland as well as three college prospects today at their South Side facility.
In addition to McFarland, linebackers Shawn Crable of Michigan and Jerod Mayo of Tennessee and running back Ryan Torain of Arizona State are visiting with the team.
The Steelers met individually with cornerback Aqib Talib of Kansas and defensive linemen Dre Moore of Maryland and Keilen Dykes of West Virginia last week.
Steelers coach Mike Tomlin is familiar with McFarland, 30, from their time together with the Tampa Bay Buccaneers.
The 6-0, 300-pounder played for the Buccaneers from 1999-2006. Traded to the Colts during the 2006 season, McFarland missed all of last season after suffering serious knee injury in August.
The Colts released him at the end of last month after McFarland failed a physical.
In other Steelers new, the team officially announced the signing of center Justin Hartwig to a two-year contract.
The 6-4, 312-pound Hartwig's deal is worth as much as $3.725 million.