Amukamara, who was ranked No. 20 on the top 99 available free agents, hit the free agent market after five seasons with the New York Giants.
Amukamara has seven career interceptions.
Here's other transactions we're tracking on Friday:
- The Bucs continued to re-tool their defense, adding pass rusher Robert Ayers. The former Giant agreed to a three-year deal worth $21 million with $10.5 million in guarantees, per Rapoport.
- The Niners re-signed kicker Phil Dawson to a one-year, $3.1 million deal, fully guaranteed, Rapoport reports.