British actor George Mackay has reportedly replaced Dane Dehaan in upcoming movie Young Americans.

DeHaan had previously been attached to portray a young Karl Rove, a policy adviser to the Republican Party, in the film, opposite his Kill Your Darlings co-star Daniel Radcliffe, who was cast as late political consultant Lee Atwater.

The script, penned by Wes Jones, is based on the 1973 real-life events surrounding Rove's campaign run for national College Republican Chairman, under the guidance of Atwater.

The Amazing Spider-Man 2 actor has since withdrawn from the project and producers have allegedly tapped Pride star MacKay to take his place, according to TheWrap.com.

The comedy, directed by John Krokidas, has also reverted back to its previous working title of College Republicans.

DeHaan recently told the publication he was having to step down from the role as it was taking too long to move into production.

“Unfortunately, I don’t think that movie is really going to work out, at least for me,” he explained. “It’s a movie I’ve been really passionate about for a long time, and it looked like it was coming together so many times, but it’s a really difficult movie to find financing for, I think because of the subject matter.

“I’m sorry to say that that’s no longer on the plate for me. I can’t speak to anyone else involved. I don’t see any time in my schedule to be able to make that.”

DeHaan's exit is the latest casting change for the movie - Shia LaBeouf and Paul Dano had also been linked to the project during the early stages of development.

Production had previously been expected to start in late 2014, but a new shoot date has yet to be set.