The 49ers have signed cornerback Will Davis, according to a team announcement. To make room, the team has waived wide receiver Rashad Ross. 
Davis has suffered two ACL tears over the course of his career. The first happened in 2014 as a member of the Dolphins and his second ACL tear went down in 2015, just weeks after the Ravens acquired him via trade. All in all, he has only 20 games to his credit over four seasons, thanks in part to the injury. We have not seen Davis on the field since November of last year when the Ravens cut him loose.
Ross originally signed with the Niners on a Reserve/Future back in January. He will be free to sign with any team unless he is claimed in the next 24 hours.