The 49ers continue to alter the bottom of their defensive line group, this time by grabbing defensive tackle Sheldon Day off of waivers from the Jacksonville Jaguars.
Day was a fourth-round pick by Jacksonville in 2016 and is familiar to 49ers defensive coordinator Robert Saleh, the Jaguars linebackers coach last year.
The Jaguars have one of the deepest lines in the NFL and waived Day over the weekend after they brought receiver Dede Westbrook back from injured reserve.
San Francisco already had an open roster spot after releasing Tony McDaniel last week. McDaniel had served as DeForest Buckner's backup at defensive tackle in recent games. That likely would be Day's role as well, although he has experience at both interior positions.
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The 49ers last month signed a trio of free-agent defensive linemen -- McDaniel, Leger Douzable and Datone Jones -- after injuries ravaged their defensive-line depth. A number of those injured players are now ready to play, including Tank Carradine, who went on injured reserve early in the season with a high-ankle sprain. In order to activate Carradine, the team must cut someone from the 53-man roster.
Day, 23, played in six games this season with three tackles, one sack and one pass defensed. San Francisco will play the Houston Texans, Tennessee Titans and Jaguars, all teams familiar to Day, in consecutive weeks next month.