Here is the total list of FCS players on rosters for the Cardinals and Steelers:

Cardinals:
Tim Hightower (RB) - Richmond
Brandon Keith (OT) - Northern Iowa
Sean Morey (WR) - Brown
Ben Patrick (TE) - Delaware
Dominique Rodgers-Cromartie (CB) - Tennessee State
Pago Togafau (LB) - Idaho State
Elliot Vallejo (OT) - UC Davis
Kurt Warner (QB) - Northern Iowa

Steelers:
Willie Colon (OT) - Hofstra

The Cardinals have quite a few former FCS players on their roster, many of whom see significant playing time.