While there was an outside chance that former Notre Dame players safety Jalen Elliott and wide receiver Chris Finke would be drafted, it was always much more likely that they would be undrafted free agents along with Asmar Bilal, Jamir Jones, Donte Vaughn, and Tony Jones Jr.
Some of these guys have better chances to make NFL rosters than others, but clearly an organization saw potential in each of the above players and decided to take a shot on them.
It is not very common for players that sign as undrafted free agents to actually make the 53-man roster for the team that signs them after the draft, but there is a solid chance that a few former Notre Dame players do make the roster.