The Los Angeles Chargers have re-signed defensive lineman Damion Square, the NFL team announced on Monday.

The former Alabama standout has been a free agent since March 13, when his two-year, $4 million contract with the Chargers reached its end.

The contract was reported as a one-year deal. The amount of the contract has not been disclosed.

In 2018, Square saw the most action of his career in his sixth NFL season. He stepped in where needed, making starts at defensive end and nose tackle for the Chargers. Square entered the season with eight starts in his NFL career, and he made 11 in 2018.

Square registered 31 tackles, three sacks and seven quarterback hits (all career highs) while playing 530 defensive snaps (52 percent of Los Angeles' plays).

Square rejoins a Chargers' defensive line that showed Justin Jones as its top interior reserve after he played 300 snaps as a rookie in 2018.

Los Angeles re-signed nose tackle Brandon Mebane to a two-year contract this offseason after he started the 12 games in which he played last season and selected Notre Dame defensive tackle Jerry Tillery in the first round of the NFL Draft on April 25.

The Chargers lost defensive tackle Darius Philon, a former Vigor High School standout, in free agency in March, when he signed with the Arizona Cardinals.

Los Angeles has Joey Bosa and Melvin Ingram set as its defensive ends.

Square was a member of three BCS national-championship teams at Alabama. He entered the NFL by making the Philadelphia Eagles' roster as an undrafted rookie in 2013.

After Square played in 10 games in 2013, the Eagles released him at the end of training camp in 2014. The Kansas City Chiefs picked up the defensive lineman, but Square never got in a game with Kansas City before being released on Oct. 31, 2014. The Chargers picked him up, but he finished that season without appearing in a game.

Square went from Dec. 29, 2013, when he played the last of his 147 defensive snaps for the Eagles, until Nov. 9, 2015, without appearing in an NFL regular-season game. He ended up playing 155 snaps in six games for the Chargers in 2015.

In 2016, Square played 362 defensive snaps in 11 games for the Chargers. He recorded the first sacks of his career, sharing a sack of Houston Texans quarterback Brock Osweiler on Nov. 27, then sacking Cleveland Browns QB Robert Griffin III two times on Dec. 24. That led to a two-year contract with the Chargers.

In 2017, Square played the full 16-game NFL regular season for the first time.

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Mark Inabinett is a sports reporter for Alabama Media Group. Follow him on Twitter at @AMarkG1.