Leonardo DiCaprio and Clint Eastwood are undecided on whether FBI Director J. Edgar Hoover was gay.

DiCaprio stars as Hoover in the upcoming Eastwood-directed J. Edgar.

The film will open the 25th edition of the AFI Festival in Hollywood, California on November 3 and will open nationwide six days later.

In the film, Armie Hammer, the 25-year-old co-star of last year's The Social Network, plays Clyde Tolson, Hoover's co-worker and life-long confidant.

But whether Hoover and Tolson were romantically involved, DiCaprio and Eastwood say in the October issue of men's fashion glossy GQ, is less certain.

“They were inseparable pals,” Eastwood said. “Now, whether he was gay or not is gonna be for the audience to interpret. It could have been just a great love story between two guys. Or it could have been a great love story that was also a sexual story.”

J. Edgar is “not a movie about two gay guys,” he added.

“If I were a betting man, I actually don't know what I would bet [regarding Hoover's sexuality],” DiCaprio adds.