She announced that she will be playing Thena in the movie.
"I'm so excited to be here," E! News quoted the actress.
"I'm gonna work 10 times harder because, I think what it means to be apart of the MCU and what it means to be part of this family, we know what the task is ahead. We know what you deserve... we are all gonna be working very, very hard," she said.
Besides Jolie, other actors attached to the project include Salma Hayek, Richard Madden, Brian Tyree Henry, Kumail Nanjiani, Lauren Ridloff and Don Lee.
Helmed by Chloe Zhao, the movie is set to release on November 6, 2020.
In the comics, Eternals are shown as physically similar to normal human beings but with powerful abilities. They have super strength, flight, teleportation, mind control, shape-shifting and energy projection. They were created from alien experiments on ancient humans millions of years ago. They lived in space cities and defended Earth from threats, like the Deviants, another race of super-humans that was more destructive and deformed.
There are a few dozen Eternals in the comics, but the movie is said to focus on two of the most prominent ones named Sersi and Ikaris.
In addition to her upcoming role in 'The Eternals', Jolie is working on another exciting Disney project 'Maleficent Mistress of All Evil'.