Mike Zimmer said he "didn't know" whether injured linebacker Anthony Barr showed progress after Thursday's practice. Perhaps that's because Barr didn't practice again for a consecutive day.

Barr (hamstring) was the only Vikings player held out Thursday. He walked through position drills during the portion of practice open to reporters, but he was not in pads. If Barr can't play Sunday in Pittsburgh, linebacker Emmanuel Lamur appears in line to start for him. Lamur (hamstring) was limited in practice.

Two midweek additions to the injury report were cornerbacks Xavier Rhodes (hip) and Terence Newman (knee). Both were limited on Thursday.

Quarterback Sam Bradford (knee) was limited again Thursday.

Guard Danny Isidora (knee) and cornerback Tramaine Brock (groin) were listed as full participants for the Vikings.

For the Steelers: DE Stephon Tuitt (biceps), S J.J. Wilcox (concussion), T Jerald Hawkins (knee) and TE Vance McDonald (back) did not practice Thursday; LB Bud Dupree (shoulder) and S Sean Davis (ankle) were limited.