The 49ers appear to have plenty of depth along their front seven, but the team brought in three defensive linemen for workouts on Tuesday, according to a source.
Two of those players are Tyson Jackson, the No. 3 overall pick of the Kansas City Chiefs in 2009, and former Steelers defensive end Ricardo Mathews, reports the NFL Network. The identity of the other player was not immediately known.
Jackson has been without a team since the Falcons released him in March with two years and $8.5 million remaining on his contract. He also worked out recently with the Los Angeles Rams.
Jackson, 31, spent his first five season in Kansas City before playing three years with the Falcons. He appeared in all 16 games last season, starting seven times, and recorded 13 tackles and no sacks.
Mathews, 30, took part in his second workout with the 49ers, according to the report. A seventh-round draft pick of the Indianapolis Colts in 2010, Mathews appeared in 16 games with five starts for the Steelers last season after signing a one-year contract for the veteran minimum. He spent the previous two seasons with the Chargers.
The 49ers have an abundance of defensive linemen, or players capable of rushing the passer from a position along the defensive line, such as DeForest Buckner, Arik Armstead, Solomon Thomas, Earl Mitchell, Elvis Dumervil, Aaron Lynch, Chris Jones, Tank Carradine, Quinton Dial, Ahmad Brooks, Eli Harold, Ronald Blair and D.J. Jones.
However, the 49ers were down three defensive linemen last week due to injuries to Buckner (ankle), Lynch (ankle) and Blair (groin). The 49ers have one opening on their 90-man roster.