GREEN BAY, Wis. — The Packers have questions about their depth at outside linebacker as they get ready for the Super Bowl.
Frank Zombo returned to practice Friday, but Erik Walden sat out and might not practice until next week.
Zombo is an undrafted free agent who became a starter in the wake of injuries. He has missed the Packers' past six games because of a right knee injury but said Friday that he felt no pain.
Walden was signed in midseason and has played well. He hurt his ankle during Sunday's NFC title game.
Both are officially listed as questionable on the initial injury report released Friday. Walden is expected to remain the starter, and Zombo said he understands.
"He's played great football," he said. "He's helped the team win."
Other Packer injuries: LB Desmond Bishop (ankle), T Chad Clifton (neck), LB A.J. Hawk (knee), WR Greg Jennings (knee) and C Jason Spitz (calf) are probable.
Steelers injuries: Steelers CB Bryant McFadden, S Troy Polamalu and WR Emmanuel Sanders practiced for the first time since the AFC title game.
McFadden strained his abdomen against Baltimore in the division round and played a diminished role Sunday. Sanders, a rookie, has an injured foot. Polamalu has been bothered by an Achilles' tendon injury, but it is not unusual for the All-Pro to sit out midweek practices.
The three — as well as LT Jonathan Scott (ribs), who has not practiced this week — are probable.
DE Aaron Smith (torn triceps) was limited in practice as has been the case for the past two weeks. Pro Bowl C Maurkice Pouncey (ankle) and special teamer Will Allen (knee) did not practice. All three are officially questionable.
Nice catch: Former Cowboy WR Drew Pearson made one of the most famous catches in NFL history, the Hail Mary from Roger Staubach that beat the Vikings in the 1975 playoffs. Thursday, he showed he still has sure hands, keeping the Lombardi Trophy in one piece.
Pearson was carrying the trophy during its Dallas-Fort Worth unveiling when the escalator he was riding stopped, sending him lurching forward. He turned one hand loose to grab a railing, kept his balance and quickly put two hands back on the trophy.
Weather watch: Fans from Green Bay and Pittsburgh won't get much of a break from the cold. The National Weather Service said freezing temperatures will descend on the Dallas-Fort Worth area early in the week, and highs might not get out of the 40s until after the game. Meteorologist Dan Huckaby said freezing rain is possible Tuesday, and the overnight low Wednesday could be in the 20s.
Bomb scare: Arlington authorities issued an all-clear after a suspicious package near Cowboys Stadium was deemed safe. Arlington fire Lt. Pete Arevalo said a package a witness reported was thrown into a drainage ditch near the stadium Friday morning turned out to be trash. The area around the stadium was closed for several minutes after the 911 call, and bomb squad personnel examined the package.