It is unknown who will take over for Gunn on Guardians of the Galaxy Vol. 3, or if the film will be cancelled altogether.
Earlier this year, director James Gunn revealed that Guardians of the Galaxy Vol. 3 would be released in 2020.
The first film was a critical and box office smash, grossing $773 million in 2014, with the 2017 sequel Guardians of the Galaxy Vol. 2 grossing $863 million.