The Raiders further bolstered their defense by signing veteran outside linebacker LaMarr Woodley to a two-year contract Thursday.

Woodley, 29, spent his first seven NFL seasons with the Pittsburgh Steelers, where he recorded 57 sacks and earned a reputation as one of the game's most versatile linebackers.

Earlier Thursday, the Raiders signed veteran defensive end Justin Tuck to a two-year contract. Tuck has the potential to earn as much as $11 million over the life of his contract. Woodley can earn as much as $12 million, according to an ESPN report.

Woodley played in a 3-4 defensive scheme his entire NFL career. The Raiders used primarily a 4-3 alignment the past two seasons under defensive coordinator Jason Tarver.

Pittsburgh Steelers outside linebacker LaMarr Woodley (56) celebrates his sack on Arizona Cardinals quarterback Kevin Kolb during the second quarter of an
Pittsburgh Steelers outside linebacker LaMarr Woodley (56) celebrates his sack on Arizona Cardinals quarterback Kevin Kolb during the second quarter of an NFL football game, Sunday, Oct. 23, 2011, in Glendale, Ariz. (AP Photo/Paul Connors) ( Paul Connors )

Given the Raiders return all three starting linebackers from last year's team — Kevin Burnett, Nick Roach and Sio Moore — it's unclear how the Raiders intend to use Woodley.

It's conceivable that the addition of Woodley means Tarver intends to switch to a 3-4 scheme or at least use that look more often than he did the past two seasons.