The 42-year-old actor, who is coming off the straight-to-DVD movie "War, Inc.," said the new action film will mark his first big budget production since 1997's "Con Air," The Times of London reported Saturday.
"The rationale is it's good to be in a big hit movie!" Cusack said of the Emmerich film. "Good for your career, and it's nice to be wanted."
Cusack did suggest it was difficult at times to adapt to the big-budget planning associated with the Hollywood production.
"It's one of those scripts where they have one line: 'Rome burns.' An entire city! I was like: 'How would you show that?' But Roland says: 'Oh yeah, it'll be great,'" Cusack said.
The actor also offered his take to The Times on new U.S. President Barack Obama.
"I sure wouldn't want to swap places with him, but he seems to be doing a reasonable, thoughtful job so far," the "Say Anything" star said.