The Saints elevated Smyth from the practice squad to the active roster Saturday, and he will serve as the team's kicker Sunday against the Dolphins.
Smyth competed with Cade York for the kicking job during Week 13 prep after the Saints waived Blake Grupe. Smyth has won that battle, and the Northern Ireland native -- who joined New Orleans in late March as a qualifying international player -- will make his NFL debut Sunday.