Sproles is a human highlight reel thanks to his incredible vision and acceleration. He finished the season on a tear, tallying eight TDs in the final six games and rushing for more than 100 yards in two of the final three. He is also a playmaker on special teams, ranking in the top-10 on kick returns (26.0 avg) and punt returns (11.3 avg).
The Chargers want Sproles back and he has stated that his first choice is to return. The only issue is money -- it could become a big one.
Odds of Returning: 30 percent
OG Mike Goff
Entering his 12th season, Goff's best days are clearly behind him. He suffers from chronic knee pain and cannot drive block as effectively as he did in his prime. All signs point to San Diego letting Goff walk, likely adding a player through free agency or the draft to compete with Scott Mruczkowski for the vacancy.
On the off chance that Goff does return, it would be on a one- or two-year deal.
Odds of Returning: 15 percent
OG Kynan Forney -- Forney was a late addition signed to provide depth. However, he was never able to work his way into the lineup; when Kris Dielman was out with the flu in Week 13, Mruczkowski got the starting nod over Forney, which is telling.
Here's what Forney had to say about the possibility of coming back to San Diego during an exclusive interview with SDBoltReport.com: "This team has a great offensive line, great quarterback and great running back. This situation is a whole lot better than the one I came from (Atlanta). I'd be more than happy to stay here."
It remains to be seen if the Chargers feel the same way. More than likely, Forney will move on and San Diego will add offensive line depth on the second day of the draft.
Odds of Returning: 10 percent
C Jeremy Newberry -- Newberry was a necessity signing last June because of Nick Hardwick's lingering foot injury. Hardwick returned in Week 4 and made it through the season without issue, negating the need to bring Newberry back for another go.
Newberry, 32, has no cartilage left in his knees and is limited in how much he can practice and play. While he's unlikely to be re-signed this offseason, he could be a midseason pickup next year if Hardwick is injured again.
Odds of Returning: 5 percent
Michael Lombardo is a member of the Pro Football Writers of America and a long-time contributor to the Scout.com network. His analysis has been published by the NFL Network, Fox Sports and MySpace Sports. He has followed the Chargers for more than 15 years and covered the team since 2003.