ALAMEDA -- Offensive tackle Donald Penn and the Raiders on Wednesday finalized a two-year contract that gives the Raiders another viable candidate to replace departed left offensive tackle Jared Veldheer.

Penn can earn as much as $9.6 million over the next two seasons, according to ESPN. Approximately half that figure is guaranteed.

As of now, the Raiders have Penn, second-year player Menelik Watson and veterans Khalif Barnes and Austin Howard in the mix for their offensive tackle spots.

Howard likely is going to wind up on the right side. Barnes has played both spots during his nine-year career. He started 11 games in place of an injured Veldheer last season.

Penn started every game the past six seasons for the Tampa Bay Buccaneers and 108 of 112 during his seven-year NFL career.

The Raiders already have added three veteran offensive linemen since free agency started Mar. 11 — Howard, Penn and guard Kevin Boothe.

Center Stefen Wisniewski is the only one of the five starters from last season assured a starting spot in 2014. Incumbent right guard Mike Brisiel is the leading candidate to start there for a third straight season.

In other news, the Raiders announced the re-signing of backup safety Usama Young. He started one of the 12 games he played last season before he was sidelined by a neck injury.

For more on the Raiders, visit the Inside the Oakland Raiders blog at ibabuzz.com/oaklandraiders. Follow Jerry McDonald on Twitter at twitter.com/Jerrymcd.