It is inevitable, though not imminent, the Chargers will add veteran depth to their defensive line.

At least one option can fill multiple spots.

Justin Bannan is among the free agents the team has expressed interest in adding to its D-line rotation, per a source familiar with the situation. The 12th-year veteran spent two of the past three seasons with coach Mike McCoy in Denver and has appeared in 160 career games with 72 starts.

His experience includes a Baltimore stint from 2006 to 2009.

There, while coached by Chuck Pagano, brother of Chargers defensive coordinator John Pagano, Bannan was one of the Ravens' best linemen out of the three-technique — positioned just outside a guard. At 6-foot-3 and 312 pounds, the Sacramento native also is capable of playing outside in a five-technique and inside at nose tackle.

In March, San Diego parted with nose tackle Antonio Garay in a cap-clearing release. It lost nose tackle Aubrayo Franklin and defensive end Vaughn Martin in free agency, as Franklin signed with the Colts and Martin joined the Dolphins.

All that has left the Chargers with the youngest defensive line in the NFL.

Four of the 10 players in their position room are undrafted rookies. The oldest veteran, Jarius Wynn, is 26. Twenty-five of the league's other 31 teams, by comparison, have at least one defensive lineman who is 30 or older. Wynn is the youngest player to be the eldest D-lineman on his team.

Adding Bannan, regarded for his run defending, is one way to add experience and ability.