That news was followed up by a response from Singer's camp, claiming that the studio did not make allowances for the director to care for an ailing parent.
X-Men director Singer was sacked by 20th Century Fox from the movie last week.
According to Deadline, production resumes next on the film with actor come filmmaker Fletcher shooting the last two weeks of the film and handling the film's post-production. At the time, Ben Whishaw was in talks to portray Freddie Mercury after Sacha Baron Cohen, another actor speculated to star and even write and direct, had walked away at some point in the process.
Fletcher joins the production after Singer was sacked on Monday after he failed to show up to set on multiple occasions.
Reports also suggest Singer clashed with leading man Malek on set, but the director has since insisted that they had patched up their differences.
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The "X-Men" filmmaker has claimed his services were "terminated" by the studio after he asked for some time off to go back to the USA to deal with "pressing health matters concerning one of my parents".
A source also tells Variety that Tom Hollander, who was set to play manager Jim Beach, left the film to due Singer's behavior.
"Bohemian Rhapsody" is scheduled for release Christmas 2018.
Dexter Fletcher will inherit the messy ongoing Bohemian Rhapsody project. Lucy Boynton (Sing Street), Aidan Gillen (Game of Thrones), Mike Myers (Austin Powers) and Joseph Mazzello (Jurassic Park) will co-star.