Fletcher -- who is best known for his impressive body of work as a character actor in films like Lock, Stock and Two Smoking Barrels, Kick-Ass, and Stardust – made his directorial debut in 2011 with the British crime drama Wild Bill, which earned him a BAFTA nomination.
Most recently, Fletcher helmed Eddie the Eagle, a biopic about Olympic skier Eddie Edwards starring Taron Egerton and Hugh Jackman.
Fletcher is boarding Bohemian Rhapsody just days after Singer was fired from the production. Fox did not state the reasons for his termination apart from citing his "unexpected unavailability." Reportedly, Singer failed to show up to set multiple times during production. Rumors of on-set tensions between Singer and Malek have also been cited as a possible reason for his firing.
However, Singer released a statement to ET on Monday addressing his exit from the project, in which he refuted claims that he was feuding with the Mr. Robot star.
"Rumors that my unexpected departure from the film was sparked by a dispute I had with Rami Malek are not true," Singer said. "While, at times, we did have creative differences on set, Rami and I successfully put those differences behind us and continued to work on the film together until just prior to Thanksgiving."
As for his "unexpected unavailability," Singer said he asked for permission to take some personal time to care for an ailing parent.
"Bohemian Rhapsody is a passion project of mine," Singer said. "With fewer than three weeks to shoot remaining, I asked Fox for some time off so I could return to the U.S. to deal with pressing health matters concerning one of my parents. This was a very taxing experience, which ultimately took a serious toll on my own health. Unfortunately, the studio was unwilling to accommodate me and terminated my services. This was not my decision and it was beyond my control."
"I wanted nothing more than to be able to finish this project and help honor the legacy of Freddie Mercury and Queen," he continued. "But Fox would not permit me to do so because I needed to temporarily put my health, and the health of my loved ones, first."
Despite the tumultuous developments, the film is still scheduled to hit theaters on Christmas Day 2018.
ET caught up with Malek earlier this year, who marveled at the opportunity to play Mercury, sharing, "I'm stoked. I mean, [Queen is] one of the most iconic bands ever, and just to be a part of that is huge." Check out the video below to hear more.