Legursky will replace Kemoeatu – a starter the last four seasons – because of performance issues, according to two sources with the team.
Legursky, a third-year pro out of Marshall, opened the season as the team's starting right guard and remained there three games until injuring his shoulder in the fourth quarter against the Indianapolis Colts.
Legursky missed the Houston game with the injury, but returned to replace an injured Kemoeatu for two games at left guard.
In the second start back, against Jacksonville, Legursky left in the second quarter after dislocating his big left toe and missed the next three games.
"I just planted my foot wrong and out it came," said Legursky.
He returned as a backup at Cincinnati, and now returns to the lineup as a starter Sunday night.
Legursky had little to say about the move before heading out to the practice field.
"They're still decision-making, as far as that's concerned," Legursky said.
But after hearing what sources in the locker room had to say, Legursky said, "Well, maybe I'm holding a little back from you."
The 6-1, 315-pound Legursky made the Steelers' practice squad as an undrafted free agent in 2008. He played in eight games as a reserve in 2009 and then played in all 19 games in 2010, starting five of them, including the Super Bowl as Maurkice Pouncey's replacement at center.