Jason Isaacs has joined the cast of the untitled "Green Zone" thriller directed by Paul Greengrass.

The Working Title/Universal project, scripted by Brian Helgeland, stars Matt Damon, Greg Kinnear and Amy Ryan, and is currently shooting in Spain.

According to Variety, the film is a fictionalized drama set in Iraq after the defeat of Saddam Hussein, inspired by Rajiv Chandrasekaran's book "Imperial Life in the Emerald City: Inside Baghdad's Green Zone" about the blunders of U.S. administrators in attempting to reconstruct the country.

Isaacs will play an American military officer.