The 49ers added their fourth Sacramento-area native to the roster Tuesday, signing cornerback Asa Jackson to a one-year deal.
Jackson, 27, originally was drafted by the Baltimore Ravens in the fifth round in 2012. Playing for the Ravens and Lions, he has appeared in 22 games with 34 tackles and four passes defensed. Jackson played high school football at Christian Brothers, which is where third-round draft pick Ahkello Witherspoon also went to school.
Defensive end Arik Armstead and tight end Cole Hikutini also are from the Sacramento region. Receiver DeAndre Carter played at Sacramento State. The 49ers have had a number of injuries at cornerback, including to rookies Zach Franklin and Adrian Colbert. The team waived Franklin to make room for Jackson.
Foster strikes again – Rookie linebacker Reuben Foster had his fourth interception of training camp when he grabbed an over-the-middle pass from Matt Barkley intended for receiver Kendrick Bourne. After lining up next to NaVorro Bowman in the first-team defense on Monday, Foster worked with the second-team unit on Tuesday.
Not to be outdone, Foster’s competition for a starting role at weak-side linebacker, Ray-Ray Armstrong, had his own interception when Brian Hoyer’s short pass to running back Tim Hightower was tipped by Bowman and snagged out of the air by Armstrong.
The 49ers have not yet said whether Foster, the 31st pick in the draft, or Armstrong will start Friday’s preseason opener against the Chiefs.
Et cetera – Safety Jaquiski Tartt (ribs) and linebacker Brock Coyle (ribs) went through individual drills but were held out of the full practice. Linebacker Eli Harold (concussion) went through a full session after sitting out the last three practices.
▪ If Tartt is held out of Friday’s game, either rookie Lorenzo Jerome or Vinnie Sunseri will start at free safety. Jerome had an interception during a two-minute drill on Tuesday.
▪ The starting guards against the Chiefs likely will be Zane Beadles on the left side and newcomer Brandon Fusco on the right.