Steelers injured reserve list:
Willie Colon (veteran starting right tackle; replacement a rookie)
Aaron Smith (longtime veteran starting left defensive end)
Byron Leftwich (supposed to be the backup quarterback)
Erik Clanton (irrelevant camp body LB)
Miguel Chavis (camp swing DE/TE who flashed potential)
Chris Hoke (longtime veteran reserve NT who received a lot of playing time)
Daniel Sepulveda (veteran punter)
Curtis Brown (rookie star special teamer who led the team in ST tackles)
Chris Carter (rookie OLB, seriously depleting OLB depth with the starters at less than 100%)
Baron Batch (promising rookie 3rd down back; forced team's hand to keep Moore)
Jonathan Dwyer (quality 2nd year back whose injury destroyed RB depth)
Rashard Mendenhall (starting RB who leaves RB depth in utter shambles)
Here are the healthy backs set to take the field against Denver:
Isaac Redman (3rd year undrafted; 3 career games with double digit carries)
John Clay (rookie undrafted;started as a camp body, made it to practice squad; signed to active roster when Dwyer went down; 10 carries for 41 yards)
Chad Spann (rookie undrafted who was only signed to the PS a few weeks ago; signed to active roster yesterday)
In addition, several key players have significant lingering injuries, including Ben Roethlisberger (ankle), Maurkice Pouncey (ankle), Emmanuel Sanders (foot; knee), Doug Legursky (shoulder; toe), Mewelde Moore (knee), James Harrison (back; toe), and LaMarr Woodley (hamstring).