Casey Affleck has denied claims he sexually harassed a woman as "preposterous and without merit".
Producer Amanda White worked with the actor and film maker on his upcoming Joaquin Phoenix documentary, I'm Still Here.
She filed a £1million suit on Friday claiming she had to endure "uninvited and unwelcome sexual advances in the workplace".
Affleck's lawyer released a statment which said: "The allegations brought upon our clients are preposterous and without merit.
"Ms. White was terminated from the production over a year ago. She and her lawyers believe that this maliciously and erroneously filed complaint will cause the producers to succumb to her outrageous and baseless demands. She is mistaken. The complaint will be vigorously defended and cross-claims will be filed against her."