The actor could be joining Matthew Fox, Brad Pitt and James Dale Badge in the film, according to Deadline.
World War Z will finally begin production this month after gaining additional financial backing to offset Paramount's costs. Marc Forster will direct the movie.
Max Brooks's novel tells the tales of people who survived an attempted zombie apocalypse.
Harris is currently attached to the role of 2008 presidential candidate John McCain in the forthcoming political drama Game Change.