A pair of starting offensive linemen remained out for the Ravens as they returned to practice Wednesday, while tight end Nick Boyle practiced after missing last week with a foot injury.
Left tackle Eugene Monroe, who left Sunday's game against the St. Louis Rams with a shoulder injury that also cost him a game earlier this season, was not on the field for the open portion of practice Wednesday.
Neither was guard Kelechi Osemele, who practiced fully last Thursday but did not participate Wednesday and Friday with a knee injury and missed Sunday's game because of the injury. He left the Week 7 loss to the Arizona Cardinals, but didn't miss any other game time before Sunday.
"I really don't have any update on that," Harbaugh said. "It's just he's working through some things."
Additionally, wide receiver Marlon Brown was not seen on the field. Brown, who was the team's No. 3 wide receiver and played 62 percent of the offensive snaps before the bye, has seen his role diminish after catching 13 passes for 106 yards in the first eight games. He played five snaps against the Jaguars in Week 10, then played four snaps Sunday and didn't have a role on special teams.