Benedict Cumberbatch, the Emmy-nominated actor who stars on the BBC America’s Sherlock, is in negotiations to join the cast of August: Osage County, the Weinstein Co.’s adaptation of the Pulitzer- and Tony-winning play.

The high-profile project counts Meryl Streep and Julia Roberts among its stars and George Clooney among its producers.

John Wells is directing the movie, which revolves around the women of a family whose lives have splintered in many directions until a crisis bring them back to their childhood home and to the dysfunctional woman (Streep) who raised them.

Cumberbatch will act as the sensitive son of Streep’s sister, Mattie Fay Aiken (Margo Martindale). She castigates and belittles the man, who believes his father is Charlie Aiken (Chris Cooper), but the truth is he’s the product of an affair.

The movie is eyeing a late-September start in Oklahoma.