DALLAS — Pittsburgh center Maurkice Pouncey sat out practice Wednesday but still expects to play in the Super Bowl.

The Steelers aren’t as optimistic about defensive end Aaron Smith. He dressed for the nearly two-hour practice but was still limited by a torn triceps, which has kept him out since he was injured in late October.

Asked if he still thought the 34-year-old Smith could play Sunday, coach Mike Tomlin said in the pool report, “I do, but it’s fading.” Second-year player Ziggy Hood continued to fill in at left end.

Pouncey sustained a high left ankle sprain in the AFC championship game. The rookie hopes to practice Friday and reiterated his chances of playing against the Green Bay Packers are 75 percent. He’s been walking with a protective boot.

“He’s a center who’s got a high ankle sprain,” Tomlin said. “If he played a skill position, we wouldn’t be having this conversation. But he’s an interior lineman. Whether he practices depends how he responds to treatment.”

Meanwhile, Green Bay outside linebacker Frank Zombo, who missed the last six games with an injured right knee, fully participated in practice. Another linebacker, Erik Walden, was limited after hurting his ankle in the NFC title game. He worked primarily with the second team.

“How Erik responds to this practice will be big,” coach Mike McCarthy said in Green Bay’s pool report. “He practiced and took reps in every team drill. That was the high end of what we were going to try to give him today. It’ll be great if he feels good tomorrow.”

Zombo appears to be back at full speed.

“Frank looks good,” McCarthy said. “I wanted to get him as much padded work as possible. It seems like Dec. 12th is the last time he’s been in pads.”