Strong-side linebacker Elvis Dumervil remains the Ravens’ only significant injury concern heading into Sunday’s game against the Minnesota Vikings. The team leader with 9 ½ sacks, Dumervil missed practice for a second straight day because of an ankle injury he suffered in last week’s game against the Pittsburgh Steelers. Dumervil was able to finish the Steelers’ game but Harbaugh acknowledged Monday that the team would have to “nurse” some things this week with the linebacker. Rookie safety Brynden Trawick (ankle) was also sidelined for a second straight day while cornerback Asa Jackson (thigh) was a nonparticipant after he was limited Wednesday.