Steelers host a pair of free agent linemen to help add depth to the roster

The Pittsburgh Steelers are far from finished with free agent signings, and if the team signing linebacker Steven Johnson Friday wasn't a good sign of them continuing their search for pieces of the puzzle, then the team hosting two free agent linemen recently certainly would point in that direction.

C Stefen Wisniewski visited Steelers, per @RapSheet. Was told DE Mike Martin (Titans) has also visited.

— Jeremy Fowler (@JFowlerESPN) March 25, 2016

Stefen Wisniewski was drafted by the Oakland Raiders in 2011, and was their starting left guard as a rookie. In his second year he was the team's starting center, and held that job title until moving to the Jacksonville Jaguars for one year in 2015.

Some might wonder why the team would be bringing in a center, especially with Maurkice Pouncey set to return to the lineup in 2016, but you can never have enough quality depth on your roster. Wisniewski provides a ton of experience at the center position, and also the position flexibility which the Steelers, and Mike Tomlin, covet in their acquisitions.

What does this mean for Cody Wallace if Wisniewski is signed? It would mean Wallace would be a part of a training camp battle for the back up interior offensive lineman job on the Steelers' roster.

As for the other linemen who was reportedly brought in for a visit, that would be defensive end Mike Martin. Martin was drafted in 2012, and the University of Michigan product has played his entire career with the Titans before becoming a free agent.

If the team would be looking at Martin as a potential free agent signing, it would help ease the loss of Steve McLendon. Martin has the position flexibility to play both defensive end and nose tackle, depending on what the situation dictates from a defensive standpoint. Again, the Steelers love position flexibility, and Martin would certainly have that feather in his proverbial cap.

The Steelers might be done making big moves, but it doesn't decrease the significance of any smaller moves the team might make until the NFL Draft. Pittsburgh's depth has been decimated on the defensive line and at inside linebacker throughout this free agent period, and they are wise to try and fill those voids with veteran experience, rather than relying on rookies to do so.