Joss Whedon is yet to sign up to direct a third Avengers film.
Whedon directed Avengers Assemble last year and is set to return for Avengers: Age of Ultron, but he is not currently on board for any further films in the franchise.
Kevin Feige, Marvel Studios president says that Whedon is currently focusing on pre-production for the second Avengers film.
Speaking to Screenrant about Whedon's future, Feige said: "It's still being determined.
"All of his efforts right now are in what he's doing for us primarily, obviously, writing and prepping Age of Ultron but also in reading the drafts of the films in Phase Two, watching early cuts and... to inform him where the characters are going to end up in the beginning of Age of Ultron and also to get his input and his wisdom into all of these.
"But right now it's all about leading up to Age of Ultron."
Feige was in London over the weekend to promote Thor: The Dark World - the second film in Marvel's Phase 2 of movies.
Avenger: Age of Ultron will being Phase 2 to a close in the summer of 2015 - Captain America: The Winter Solider and Guardians of the Galaxy are set to be released next year.
Robert Downey Jr, Chris Evans, Chris Hemsworth, Scarlett Johansson, Mark Ruffalo and Jeremy Renner are all set to reprise their roles in Avengers: Age of Ultron - which is already one of the most anticipated films of 2015.
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