SANTA CLARA — Cornerback Carlos Rogers participated in part of practice Friday, but he is questionable for the 49ers game against the Green Bay Packers as a result of a lingering hamstring injury.

"I ran on it," Rogers said as he walked by while his teammates wrapped up practice on a nearby field. "But I don't know."

Coach Jim Harbaugh didn't go into any detail about Rogers' situation, though he confirmed that Rogers and fellow cornerback Eric Wright are questionable for the Packers game Sunday.

Rogers missed all of practice Wednesday and Thursday. He was on the field for stretching and other exercises Friday. However, he was the lone player without a helmet.

If Rogers can't play, Tarell Brown is expected to start opposite Tramaine Brock. Brown started 10 games earlier this season, but none since Nov. 17.

Wright, who tweaked a hamstring in practice Wednesday, practiced Friday without showing any lingering effects from an injury that limited his participation Thursday.

Wide receiver Michael Crabtree (quadriceps) and linebacker Dan Skuta (foot) also were limited in practice Friday. Crabtree is probable for the Packers game. Skuta is questionable.