Every year, there are players who go undrafted who hoped to hear their names called as one of the many in the NFL Draft. For many of them, as soon as the Draft ends their phone starts ringing with calls from NFL teams who want to offer them an Undrafted Free Agent spot.
There have been plenty of Tigers who have done very well with those spots in recent years. A number of Tigers - like Chris Davis, Brandon King, Trovon Reed, and many others - have found their way onto active rosters and contributed to their teams in a big way through this route.