While the Steelers activated him from the physically unable to perform list, Rashard Mendenhall is unlikely to play in the team's season opener, according to a source.

In fact, Pittsburgh may not have Mendenhall for the entire month of September.

Mendenhall suffered a torn anterior cruciate ligament in the Jan. 1 regular-season finale at Cleveland.

If the Steelers hadn't activated Mendenhall, he would not have been eligible to play in the team's first six games.

Isaac Redman is dealing with a hip injury.