Free safety Eugene Wilson came and left the Steelers on Tuesday without a contract offer.
Guard/center Rex Hadnot visited Wednesday, though he, too, hasn't received a formal contract offer as of yet.
Wilson would be likely need to be promised a starting job to be induced into signing with the Steelers, who are optimistic Ryan Clark can return from his medical problems of last year.
Clark has been working out at the team's facility after having surgery during the season to have his spleen removed.
Anthony Smith started in Clark's place after the surgery and was benched late in the year in favor of veteran Tyrone Carter.
Hadnot would be used as a veteran to push Chris Kemoeatu at left guard – in place of Alan Faneca – and Sean Mahan and Darnell Stapleton at center.
At 6-2, 325 pounds, he has more bulk than the 295-pound Mahan, who was the team's starting center last year.