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ALAMEDA -- Cornerback Ron Bartell was back on the field Wednesday for the first time since breaking his shoulder blade in the season opener as the Raiders began preparations for facing the Tampa Bay Buccaneers.

Bartell sat out the mandatory six games on the NFL's new "designated for return" injured reserve list but is not eligible to play until the Raiders visit the Baltimore Ravens on Nov. 11.

The Raiders have 21 days to either activate Bartell or put him on injured reserve for the remainder of the season, and don't have to make a roster move until one or the other occurs.

Players who were on the field included center Stefen Wisniewski (ankle) and running back Mike Goodson (turf toe). Wisniewski came out of the Kansas City game with an ankle injury and coach Dennis Allen expressed concern of Goodson's availability at his Monday press conference.

Linebacker Aaron Curry was participating in his seventh straight practice since going on the physically unable to perform list. Allen said Monday the Raiders had considered activating him but hadn't figured out the corresponding roster move.

Assuming Curry is activated, a player will have to be cut from the roster, as is the case with Bartell a week from Saturday.

Aside from releasing players, another option is by trade. The NFL trading deadline is Thurdsay, and the Raiders could trade players for late-round picks or conditional picks.

Defensive tackle Richard Seymour did not appear to be practicing as warm-ups and drills came to a close and the team sessions began.

Still no sign of cornerback Shawntae Spencer (foot) and tackle Khalif Barnes (groin), both of whom have been out since being injured Week 2 against Miami.

In other news the Raiders signed offensive lineman Jason Foster, an undrafted free agent out of Rhode Island, to the practice squad. He replaces defensive back Akwasi Owusu-Ansah, who was released.

The Raiders worked out six players on Tuesday's off day -- quarterback Aaron Corp, wide receiver Salim Hakeem, tight end Cooper Helfet, cornerback Buddy Jackson, safety Cory Nelms and wide receiver/return specialist Shaky Smithson.