Director Bryan Singer says a crossover between the X-Men and Fantastic Four franchises could happen, depending on the success of “X-Men: Apocalypse” and the “Fantastic Four” reboot.

Singer made the disclosure in an interview with Yahoo Movies about the home entertainment release of “X-Men: Days of Future Past — The Rogue Cut,” which is Singer’s cut of the film and includes 17 more minutes than the theatrical release.

“There are those ideas in play,” Singer said. “That would be a natural match-up because they’re both ensemble films and there is a mechanism by which to do it.”

He added, “We have to see how the films turn out — how this film turns out, how ‘Fantastic Four’ plays, to really understand what kind of desire and how that would really work. I think to just say you’re gonna do it is a mistake. You have to see how the films evolve before you make the decision to completely commit to that.”

Singer would not give further details about the how the franchises would be combined other than saying: “It deals with time. That’s all I’m going to say.”

Singer directed last year’s “X-Men: Days of Future Past,” which grossed $748 million worldwide, and is in production on the sequel “X-Men: Apocalypse,” which opens May 27. Fox is releasing the “Fantastic Four” reboot on Aug. 7.

Fox did not respond to a request for comment.