Vidya, 37, recently met her "Kahaani" director and patched up after their apparent fallout post the 2012 hit thriller.
There were reports of Ghosh having offered her the biopic "Durga Rani Singh", which Aishwarya was supposed to be a part of.
"Not aware of that," the actress told reporters here, at the opening ceremony of 17th Jio MAMI Mumbai Film Festival, when asked if she had replaced Aishwarya in the project.
Before Aishwarya, the film was offered to Kangana Ranaut.
More From This Section
On the occasion, the 28-year-old "Queen" star said her role was "physically demanding" in the love-triangle.
"The role is physically demanding, with things like riding, belle...It is tough," Kangana said.
In "Rangoon", she plays an actress who is romantically involved with her mentor. The film is set in the 1940s during the World War II and is about three characters- a superstar, her mentor and a soldier.