The TV show will feature Jason Ritter and Alexis Bledel as young lovers Gavin and Stacey. The cast also includes Michael Ian Black and Ashlie Atkinson.
Mandvi will play Dave Coaches, a security guard roadie for the Dave Matthews Band and Stacey's best friend Nessa (Atkinson)'s ex.
Mandvi's film credits include "The Internship," "Premium Rush," "The Last Airbender," "The Proposal" and "Ghost Town." His TV work includes "The Daily Show," "Law & Order: Criminal Intent" and "Oz."
His stage credits include Oklahoma!, Sakina's Restaurant, Homebody/Kabul, Einstein's Gift and Disgraced.