Banjo was signed to the Cardinals' active roster Monday.
Banjo was let go by Arizona at the end of August but began the season on the team's practice squad and was elevated to the active roster for each of the last three games. The 31-year-old has totaled two tackles (one solo) while playing mainly on special teams this year, and he'll serve as depth at free safety after Charles Washington (hamstring) was placed on injured reserve last week.