At most, the Pittsburgh Steelers are projected to have only two starters for the 2020 season who were not already on the team and in the system in 2020, not including the fullback position. A new defensive tackle could potentially be their primary player there, for however much that position might play. It’s possible as well that a new face could start at left guard, though far from guaranteed.
If it is a new face, it would almost surely be Stefen Wisniewski, the 31-year-old veteran interior lineman who has over 100 career starts under his belt, including five with the Kansas City Chiefs last year, where he won the Super Bowl blocking for Patrick Mahomes.