Brad Pitt has quit Darren Aronofsky's The Fighter, throwing the project's future into doubt.

According to The Playlist, Pitt will no longer star opposite Mark Wahlberg in the boxing drama. It is the second time he has left an Aronofksy movie after departing The Fountain in 2002.

Mark Wahlberg, who will play 'Irish' Mickey Ward, hinted that Pitt's departure has held up the film.

"They finally got the green light," he told Coming Soon. "Now we have to figure out the cast thing."

Wahlberg added that he had been training for two years for The Fighter, saying: "It's too depressing to talk about. I get up everyday at 5am to train for a movie that might not even happen."

Aronofsky, whose upcoming film The Wrestler has received a positive critical reaction on the festival circuit, is currently circling a Robocop remake.

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