Last season, Rod Streater made the Oakland Raiders as an undrafted free agent and had a very productive rookie campaign with 39 receptions for 584 yards and three touchdowns. Undrafted rookies can make an impact in Year 1, but they can also make the roster and take some time to develop.
When Reggie McKenzie was with the Packers, they signed Tramon Williams as an undrafted free agent, and he's become one of the better cornerbacks in the league. It took Williams three years to become a starter and two to see regular playing time.
Every year at least one guy makes the team who wasn't drafted, and the lack of depth on the Raiders could open the door for three or four such players to make the team this year. Hopefully, McKenzie's second group of undrafted free agents yields a gem like Streater or Williams.
The Raiders announced 14 total signings with many previously reported signings not on the list. It's likely that the Raiders will bring many of them in for a try out during mini camp if they aren't signed by another team.