The Chargers remain interested in re-signing Darren Sproles, but they won't retain him on a one-year basis as they did in 2009. Sproles made a little more than $6.6 million last season as San Diego's franchise player. Because of that, he'd earn almost $7.3 million if they tender him as a restricted free agent. The two sides are expected to discuss an extension, but if an agreement can't be reached Sproles could leave the Chargers just as LaDainian Tomlinson did earlier this week.