Titled More As the Story Develops, the show follows a group of people working in a broadcast newsroom.
The Slumdog Millionaire actor will play an employee at the network where the fictional show takes place, according to Variety.
The series also stars Jeff Daniels, Emily Mortimer, Olivia Munn and Alison Pill.
John Gallagher Jr, Thomas Sadoski and Josh Pence recently signed on to the series as well.
HBO announced that it had picked up the Social Network scribe's pilot in late January.
Sorkin is currently teaming up with Office star John Krasinski for a mini-series about Hollywood's legendary Chateau Marmont.
Patel previously starred on Skins.