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

The team 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. Since 1994, the only other team to allow as many kickoff return scores in a single season was Minnesota, which gave up four in 1998.

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