Adam Caplan: They could probably use veteran depth at guard, offensive tackle, defensive end, outside linebacker and safety.
Players that make some sense are: Pete Kendall (G), Kendall Simmons (G), Jonas Jennings (OT), Kwame Harris (OT), Vonnie Holliday (DE), Anthony Weaver (DE), Keith Davis (S/good special teams player) and Corey Chavous (S).
The Chargers don't have a lot of salary cap space left (roughly $8 million) so they probably could only sign two veterans.
ML: Have you heard anything on the contract-extension talks going on with Philip Rivers? Can he expect a Ben Roethlisberger-type deal (six years, $102 million)?
AC: I haven't lately, but Eli Manning and Rivers are the two that are expected to get done some time before the season ends since both are at the end of their contracts. It will be interesting to see what they get since Roethlisberger's deal averages about $14.6 million per season.
WR Vincent Jackson
AC: According to several personnel evaluators, McNeill hasn't played at a high level since his rookie season in 2006, so it's possible the team waits to see how he does this season. Plus, he won't be a UFA unless the CBA gets completed before free agency in 2010.
As for Jackson, he's in the same boat as McNeill and Jackson's off-the-field issues won't help him get a lucrative deal. Despite that, he's coming off of a breakout season of sorts and I think many have finally started to see him tap his enormous potential.
ML: The Chargers have said they will not re-sign center Jeremy Newberry, yet the team has virtually no depth at center. Given Newberry's desire to stay in the state of California , what are the odds he re-signs after the draft or during training camp?
AC: Newberry is probably looking at a one-year deal for the veteran minimum wherever he signs. The Chargers don't currently have a backup center, so they will have to sign a veteran at some point.
Eric Ghiaciuc or Melvin Fowler make sense to sign before camp opens.
ML: Do you see Darren Sproles agreeing to a long-term deal before the start of the season? What kind of money is he looking at?
AC: He's a unique player and it will be interesting to see what he gets since he's under the franchise tender ($6.621 million) at this point. It would be to their advantage to get him at a much lower cap number for this season so they could sign some more veterans. I'd think he would get a deal that averages $4-5 million per season based on his projected role over the next few seasons.
ML: Is former Chargers linebacker Marques Harris getting any play on the open market? What teams could be interested in him?
AC: He's basically a fourth or fifth linebacker and special teams player who should receive more interest closer to the opening of training camp.
Teams that could have an interest include the Cleveland Browns, Dallas Cowboys, Denver Broncos, Green Bay Packers, and New England Patriots. I don't see the Pittsburgh Steelers having interest in him since they have decent depth at OLB.
Adam Caplan is Scout.com's national NFL reporter. He is also a host/analyst on Sirius NFL Radio. Caplan specializes in free agency, player signings and the draft. You can read more of his articles on the Scout.com NFL Experts site.