Redman had been named as joint starter alongside rookie Le'Veon Bell on the team's depth chart, but the second-round draft pick will miss the start of the season with a foot sprain.
The head coach told reporters: "We know what Isaac is capable of. He's answered the bell for us in the past. We expect him to do it in a big way moving forward.
"We're continuing to get to know [recent signing] Felix [Jones]. We like his natural run instincts. He quickly proved that he can do some positive things in terms of running the football."
Redman added: "If everything holds up and I stay healthy, I'm planning on going out there and performing and [keeping the coaches from] wanting to put anyone else in."
The Steelers play the Tennessee Titans on Sunday.