The 49ers have added a notable name to the defensive line. And it’s not the player we were expecting. The 49ers have signed defensive lineman Sen’Derrick Marks to a one-year deal, the team announced. 
Marks spent the first four years of his career with the Titans before joining the Jaguars in 2013. He did well in Jacksonville, up until suffering an ACL tear in Week 17 of the 2014 season. The 30-year-old defensive tackle has started in just three games since that injury.
If healthy, Marks could prove to be a valuable asset for San Francisco. It also helps that he has three years of experience playing under current Niners defensive coordinator Robert Saleh.
Marks registered 4.0 sacks in 2013 and 8.5 sacks in 2014. Last year, he recorded just 3.5 sacks as a part-timer but he did appear in all 16 contests. if he makes the final cut, he’ll provide depth for a unit that is currently missing DeForest Buckner, Aaron Lynch, and Ronald Blair due to injuries.
Earlier this week, the Niners also auditioned former No. 3 overall pick Tyson Jackson and Ricardo Mathews. Apparently, Marks outperformed both players.
With the addition of Marks, the Niners are now back up to the 90-man roster max.