Running back Tevin Coleman wore No. 26 over the last two seasons. He has since signed with the New York Jets.
Tartt returned to the 49ers on a one-year deal after testing the free-agency waters.
"We are very excited to have Jaquiski back with our team," general manager John Lynch said via a statement after the signing became official. "Jaquiski is an extremely skilled and versatile player who provides excellent communication skills for our defense.
The 49ers made Tartt a second-round selection out of Samford in 2015. He recorded 30 tackles, one tackle for a loss, an interception, and four passes defended through seven games in 2020 before landing on injured reserve due to a toe injury.
"At this point, I'm doing well, and surgery went well," Tartt told reporters in March. "Rehab has been going well. But when it happened, I thought I was probably going to miss a game or two. To get the news that it was a Grade-3, it was tough for me."
Tartt, 29, has 301 tackles, 16 tackles for a loss, four interceptions, four sacks, and 17 passes defensed during his six NFL seasons.
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