Chargers sign linebacker Thomas Keiser

AP

Just two days after losing Melvin Ingram to a torn ACL, the San Diego Chargers have made a move to bring in additional depth at the linebacker position.

The Chargers announced Thursday they have signed former Carolina Panthers linebacker Thomas Keiser. Keiser was waived by the Panthers on Monday.

Ingram suffered a torn ACL during offseason workouts on Tuesday and has to be considered a long-shot at best to play this season for the Chargers. Keiser showed promise as a rookie with the Panthers in 2011. He recorded four sacks and an interception in just eight games played. Keiser appeared in just four games last season before tearing ligaments in his elbow and landing on injured reserve.

In addition to Keiser, the Chargers are also looking into Dwight Freeney as a possible replacement for Ingram.