The Lions are still studying any and all ways to upgrade their roster, including possibly adding a starter at middle linebacker (Larry Foote?) and a backup at quarterback.

“There's not many positions on this team that on April 30 that we're saying, 'We're set, we're 100 percent set at that position. We're good, don't worry about that,'” Lions coach Jim Schwartz said. “We still have a lot of work to do.”

The two most pressing needs are middle linebacker, where the Lions drafted DeAndre Levy in the third round last week, and defensive tackle, where good big men are hard to find. Levy will play exclusively in the middle at this weekend's rookie orientation, and is penciled in as the starter for now.

But the Steelers could trade or release Foote, a Detroit native, and the Lions are in a position to sign him if they choose.

“It's fair to say that we're looking (at middle linebacker) and we're also looking at a lot of other positions,” Schwartz said. “Now, that being said, that doesn't mean it'll necessarily happen. We'll see where we go with the guys on our roster, see where we go with the guys that are drafted and their play will determine a lot of where we go.”

Schwartz cautioned about reading too much into performance at this weekend's camp, which serves more as a welcome-to-the-NFL session with the rookies than a test of football ability.

“Middle linebackers need mouthpieces and shoulder pads,” he said. “One of the biggest things here is to get a good feel for the guys athletically.”

At defensive tackle, there aren't many options available, though the Lions did welcome end Kevin Carter in for a visit recently. Carter played four seasons with Schwartz in Tennessee, and Schwartz said he's a “giant” who could double as a defensive tackle in nickel situations.

The Lions could be in the market for a third quarterback, too. For now, Daunte Culpepper is the starter, Matthew Stafford is the future and Drew Stanton is No. 3 on the depth chart, but Stanton won't get many reps going forward and the Lions might want a veteran for insurance instead.

“There's so many different paths you could take there,” Schwartz said. “That wouldn't necessarily mean bring a veteran in to compete, it might be bring a veteran in to learn as an insurance policy, something like that. A lot of different ways you can go with it. We're not there yet. We'll cross that bridge when we get to it.”