DE Aaron Smith, NT Casey Hampton and LG Chris Kemoeatu have been ruled out of Sunday's Week 5 game against Tennessee, the Steelers reported Friday afternoon.
DE Brett Keisel will return to the lineup, moving back-up Ziggy Hood to Smith's left end position. Either Chris Hoke or Steve McClendon will start in place of Hampton. Doug Legursky also returns, and he will replace Kemoeatu at left guard, with Ramon Foster staying at right guard.
QB Ben Roethlisberger is probable with a foot injury he suffered in last week's 17-10 loss at Houston. RB Mewelde Moore and OLB Jason Worilds have both been ruled out for Sunday's game as well.
Rashard Mendenhall is listed as questionable with a hamstring injury, and with Moore out, it looks like he'll have to play. Fortunately for the Steelers, it appears Isaac Redman is, as of right now, uninjured.
CB Cortez Allen rounds out the players the Steelers listed as questionable.
Both the offensive and defensive lines have dealt with new lineups multiple times in this young 2011 season. Keisel was playing at a high level before his knee injury kept him out the past two weeks. Legursky and Hood are now making their second starts of the season at a new position.