The 49ers have been making a significant amount of roster changes lately, their most recent being their signing of Vikings cornerback Antone Exum Jr.
The 26-year-old was a sixth-round draft pick for the Vikings, and was recruited out of Virginia Tech in 2014. In his time with the Vikings, he started in two of the 27 games he played, and accumulated 19 tackles and one forced fumble.
Exum was waived by the Vikings September of this year after spending the 2016 season on the injured reserve list.
Signing Exum is the most recent roster change the 49ers have made, following their acquisitions of wide receiver Louis Murphy and quarterback Jimmy Garoppolo. Cornerback Rashard Robinson was also recently traded to the New York Jets.