BEVERLY HILLS, Calif. -- "Game of Thrones" fans, brace yourselves: The fantasy saga's end is perhaps just a few years away.

HBO programming chief Michael Lombardo said Thursday that the producers of the drama series are leaning toward three more seasons after they just concluded season five.

Lombardo told a TV critics' meeting in Beverly Hills, California, that he hopes they'll change their minds, but that appears to be their intent.

Asked about the possibility of a prequel series, Lombardo said he believed there's "enormous story material" to be mined for such a project. But he says the focus now is the sixth season of "Game of Thrones," planned for 2016.