Well before the casts of "X-Men: Apocalypse," "Deadpool," "Gambit" and "Fantastic Four" posed together for a massive cast photo while at Comic-Con International, rumors have been swirling that Fox has plans to bring all of their Marvel properties together into a shared cinematic universe. In an interview with Yahoo! Movies, "X-Men: Apocalypse" director Bryan Singer tackled those rumors head on.

Singer corroborated the X-Men and Fantastic Four team-up talk, saying that he has engaged in conversations with the "Fantastic Four" team -- which includes "Apocalypse" writer/producer Simon Kinberg -- to find a way to bring Fox's two Marvel franchises together.

"Those ideas are in play," said Singer. "That would be a natural match-up because they're both ensemble films and there is a natural mechanism by which to do it. I don't want to give it away, but it deals a little with time. That's all I'm going to say."

Since the relaunch of the X-Men franchise in 2011 with "X-Men: First Class," the mutants have been hopping through the decades. They've moved from the '60s to the '70s in 2014's "X-Men: Days of Future Past" and will land in the '80s in next year's "Apocalypse." And as seen in trailers for this August's "Fantastic Four," we know that the rebooted foursome are interdimensional travelers. As Singer stated, the mechanism for their potential crossover does seem natural.

"We'll have to see how the films turn out -- how ['X-Men: Apocalypse'] 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 going to do it would be a mistake. You have to see how the films evolve before you make that decision to completely commit to that. But there are those ideas in play."

From the sound of Singer's answer, it looks like we may know more about this potential crossover after "Fantastic Four" opens on August 7 and "X-Men: Apocalypse" opens on May 27, 2016.