The 53-year-old director took over the DC film after Zack Snyder left the project in wake of his daughter's sudden death.
The actor, who will reprise his role as Bruce Wayne/ Batman from the film "Superman v Batman: Dawn of Justice", says Whedon helped define the tone of the movie like any able storyteller.
"Joss just brought to the movie what good directors bring, which is good taste. An instinct for realism and for finding the humanity in the characters and the humanity in the conflict, then making it accessible and relevant. I think that's one of the things he did so well with Avengers, frankly.
"Justice League" is set for a November 17 release in the UK.
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