"I was going to do a narrative film, and in fact, Shia LaBeouf was cast to play Kate's character," Sia told Australia's Studio 10, according to the Daily Mail. "I asked for a meeting with her, and she said she was born to do it. She could sing, she could dance, she could do it all."
Music features Sia's frequent collaborator Maddie Ziegler as an autistic girl who is forced to move in with her drug-dealing half-sister, played by Hudson.
Sia didn't expand on why LaBeouf was dumped from the movie, but her comments emerge days after she weighed in on the actor's legal troubles, following a lawsuit from his ex-girlfriend, singer FKA twigs, for the "relentless abuse" she allegedly suffered during their 2018-2019 romance.
Sharing a link to The New York Times report about the suit, Sia tweeted, "I too have been hurt emotionally by Shia, a pathological liar, who conned me into an adulterous relationship claiming to be single."
"I believe he's very sick and have compassion for him AND his victims. Just know, if you love yourself - stay safe, stay away."
Sia, who previously recruited LaBeouf for her 2015 video "Elastic Heart", added, "Also I love you @fkatwigs. This is very courageous and I'm very proud of you."
LaBeouf has admitted to hurting people he loved in the past, but claims many of the accusations made by Twigs are untrue.
He has yet to respond to Sia's allegations.