The 49ers are bringing back defensive tackle Chris Jones, according to Mike Garafolo of NFL.com (on Twitter). Jones played in six games (all starts) for the Niners in 2016 but lost the 2017 season to injury. 
After undergoing hip and groin surgeries, Jones is said to be fully healthy. And, now that Cedric Thornton is stepping away from football, he’ll have a chance to be a contributor. He’ll join Earl Mitchell, DeForest Buckner, D.J. Jones, and Sheldon Day on the team’s defensive tackle depth chart.
When healthy, Jones has proven that he can be a productive player. In his first two seasons with the Patriots, Jones put up a combined nine sacks and 88 tackles.
Jones, not to be confused with the Chiefs defensive tackle of the same name, turned 28 in July.
9ers need to bring back Dumerville. They are hoping to be able to get to the QB this season and so far in pre season none of the guys on D seem to be able to do that and Dumerville led the team in sacks last season. Think they should def briefly bring him back. Armsteam might need to go if he he can’t stay healthy this season