The San Diego Chargers hoped that linebacker Melvin Ingram would take a big step forward in his second season. Now it's possible Ingram won't have a second season at all.

NFL.com's Ian Rapoport reported Tuesday on "NFL Total Access" that doctors fear Ingram suffered a torn anterior cruciate ligament during the Chargers' organized team activities.

If Ingram has a complete tear of the ACL, he'll undergo surgery that likely will sideline him for the entire 2013 season.

Ingram -- the 18th overall pick in the 2012 NFL Draft -- is coming off an underwhelming rookie season in which he made just one start in 16 games. He finished with 16 tackles, one sack and one forced fumble.