Does bringing back Vincent Jackson make sense for Chargers?

COSTA MESA, Calif. -- It's about that time.

Los Angeles Chargers players are spending their last weekend of free time relaxing. The team is scheduled to report to training camp Saturday and hold its first practice at Jack Hammett Sports Complex in a week's time on Sunday.

Chargers staffers are busily preparing for their first training camp in this city. Some players have already begun trickling back to get ready, including cornerback Trovon Reed, who will host two youth football camps over the weekend.

Here at ESPN.com, we'll take a closer look at the Chargers' projected 53-man roster and starting lineup next week leading up to the opening of training camp.

Here's our first question from this week's mailbag:

@eric_d_williams: Vincent Jackson was productive during his time with the Chargers.

Selected in the draft's second round in 2005 out of Northern Colorado, Jackson totaled 272 receptions for 4,754 receiving yards and 37 touchdowns in seven seasons with the team, earning invitations to the Pro Bowl in 2009 and 2011.

At 6-5 and 221 pounds, Jackson was the prototypical big receiver Philip Rivers liked to throw to because of his ability to high-point the ball on vertical routes.

However, things turned ugly when Jackson held out for 10 games during the 2010 season over a contract dispute. The Chargers placed the franchise tag on Jackson in 2011 and he signed a five-year, $55 million deal in free agency with the Tampa Bay Buccaneers the following offseason.

Jackson had 1,000-yard receiving seasons for the Bucs his first two years there, but his play fell off of late. Because of injuries, Jackson played only 15 games over the last two years.

Jackson became an unrestricted free agent in March and remains unsigned. He could make sense for the Chargers as a replacement for Mike Williams if the rookie is going to be out longterm because of a back injury.

But Jackson is 34 and suffered a torn ACL in his left knee midway through last season, so he's not exactly the picture of good health.

The Chargers also have other veteran receivers more experienced with the team's offensive scheme available on the free-agent market who they could bring back, including Stevie Johnson, Vincent Brown and Javontee Herndon.

Along with that, the Chargers have receivers on the back end of the roster they like, including Geremy Davis, Jamaal Jones and Da'Ron Brown.

So at this point at the start of training camp, bringing back Jackson doesn't make sense for the Chargers.

@eric_d_williams: A couple of names come to mind as undrafted rookies who could make noise during training camp.

BYU product cornerback Michael Davis has caught the eye of head coach Anthony Lynn, getting reps with the first-unit defense with Casey Hayward and Jason Verrett nursing injuries during organized team activities and minicamp.

At 6-2 and 196 pounds, Davis ran a 4.4-second 40-yard time at his pro day and fits the mold of a long, rangy corner that defensive coordinator Gus Bradley prefers in his Seattle Cover 3 scheme.

Davis made a handful of pass breakups during offseason work.

The other player is Notre Dame linebacker James Onwualu. At 6-1 and 232 pounds, the Chargers like Onwualu's versatility. He has the ability to rush the passer and the speed to keep up with running backs and tight ends in coverage.

Onwualu also projects as an effective special-teams players because of his athleticism.