PITTSBURGH — The Pittsburgh made two moves intended to improve their sagging special teams, signing linebacker Rocky Boiman and cornerback Corey Ivy.

They also released linebacker Donovan Woods, who was activated off the practice squad only last week, and cornerback Keiwan Ratliff.

Boiman, an eight-year veteran, and Ivy, a nine-year veteran, have played special teams throughout their careers.

The Steelers have permitted an NFL-high four kickoff return touchdowns in their last five games, which equals the number Minnesota gave up in a full season in 1998.