Whilst there has been much speculation over his involvement in Justice League since Zack Snyder handed over the reigns to Joss Whedon, Warner Brothers have now confirmed that Joss will receive a co-writing credit on the film.

Here are the details:

Director: Zack Snyder

Writers: Story by Chris Terrio & Zack Snyder, Screenplay by Chris Terrio and Joss Whedon
Based on characters from DC Entertainment, Superman created by Jerry Siegel and Joe Shuster

Producers: Charles Roven, Deborah Snyder, Jon Berg, Geoff Johns

Executive Producers: Jim Rowe, Wesley Coller, Curtis Kanemoto, Chris Terrio, Ben Affleck

Cast: Ben Affleck, Henry Cavill, Gal Gadot, Raymond Fisher, Jason Momoa, Ezra Miller

Action Adventure. Fueled by his restored faith in humanity and inspired by Superman’s selfless act, Bruce Wayne enlists the help of his newfound ally, Diana Prince, to face an even greater enemy. Together, Batman and Wonder Woman work quickly to find and recruit a team of metahumans to stand against this newly awakened threat. But despite the formation of this unprecedented league of heroes—Batman, Wonder Woman, Aquaman, Cyborg and The Flash—it may already be too late to save the planet from an assault of catastrophic proportions.

Source: We Got This Covered