The 20 year-old star has confirmed that she declined a part in the film A Woman of Importance, which will also star Annette Bening.
Lohan decided not to take the role so that she can continue her treatment for alcohol abuse.
Leslie Sloane Zelnick, Lohan’s representative, told People magazine, "It’s a mature thing to do. She’s doing this so she can focus on getting better."
Lohan, who is currently in a California detoxification centre, was given permission to leave the facility to work on the film I Know Who Killed Me, but will not do the same for another film. Said her rep, "She doesn’t want to just yes to everyone and compromise herself anymore."