There are a slew of players suiting up for the 49ers against the Las Vegas Raiders on Saturday who are almost certainly not going to make the 53-man roster. That turns our attention to the rookie class where a handful of first-year players are aiming to work their way into the starting lineup.

The San Francisco 49ers have signed running back Ke'Shawn Vaughn to a one-year deal. To make room on the roster, the team waived offensive lineman Zack Johnson. San Francisco is preparing to host the Denver Broncos at Levi's Stadium tonight in their preseason opener. The...