Despite Bret Easton Ellis' enthusiastic casting announcement on Tuesday, Lindsay Lohan has yet to officially sign on to the controversial author's new film "The Canyons."

RadarOnline reports that Lohan has concerns about the extensive nudity and graphic sex scenes required for the role of Tara, a former model and girlfriend to Christian, a trust fund brat who enjoys filming his threesomes with various conquests, who will be played by porn star James Deen.

"The Canyons" is a contemporary thriller that documents "five twenty-somethings' quest for power, love, sex and success in 2012 Hollywood," and will be directed by Paul Schrader, who wrote classic movies such as "Taxi Driver" and "Raging Bull."

Though Lohan was cast in the role, is a fan of Ellis' writing and is eager to work with Schrader, a source tells RadarOnline that both she and her team are concerned about the nudity involved.

"Lindsay would be required to do full frontal nudity, and the sex scenes are very, very graphic," a source close to the actress told the website. "Yes, Lindsay has posed nude for Playboy, but doing it in a movie is completely different. Lindsay needs to make sure that she is comfortable with it, and that this is something she can handle as an artist."

Despite her concerns, the source says it's expected that Lohan will sign the contract within the next two weeks, as filming is scheduled to start on July 9.

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    Lindsay Lohan attends the 2012 White House Correspondents' Association Dinner held at the Washington Hilton on April 28, 2012 in Washington, DC. This was the 98th annual dinner and was hosted by Jimmy Kimmel. (Photo by Kristoffer Tripplaar-Pool/Getty Images)

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    Lindsay Lohan attends the 98th Annual White House Correspondents' Association Dinner at the Washington Hilton on April 28, 2012 in Washington, DC. (Photo by Stephen Lovekin/Getty Images)

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    Actress Lindsay Lohan attends day 3 of the 2012 Coachella Valley Music & Arts Festival at the Empire Polo Field on April 15, 2012 in Indio, California. (Photo by Christopher Polk/Getty Images for Coachella)

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    Lindsay Lohan attends her probation hearing with attorney Shawn Chapman Holley (not pictured) at the Airport Courthouse on March 29, 2012 in Los Angeles, California. Judge Stephanie Sautner ended Lohan's formal probation after concluding that she has completed the terms of her sentence for her 2007 DUI conviction and probation violations. Lohan is now on informal probation until May 2014 for her 2011 Venice, California jewelry theft conviction. (Photo by Joe Klamer-Pool/Getty Images)

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    Actress Lindsay Lohan attends a probation progress report hearing at Superior Court in Los Angeles, California, March 29, 2012. Los Angeles Superior Court Judge Stephanie Sautner decided to take Lohan off probation from a 2007 drunken driving case. Sautner also decided that Lohan will no longer have to meet with a probation officer or appear in court on her 2011 shoplifting case, as long as she obeys all laws through May 2014. AFP PHOTO / POOL / JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

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    Actress Lindsay Lohan attends Domingo Zapata's Oscar Art Show Presented by Mr. C Beverly Hills on February 22, 2012 in Beverly Hills, California. (Getty)

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    Lindsay Lohan leaves the Airport Courthouse after her probation update hearing on February 22, 2012 in Los Angeles, California. Lohan is currently performing 480 hours of community service at the Los Angeles County Coroner's office and attending court ordered psychotherapy sessions stemming from a 2007 drunk-driving conviction and a jewelry theft conviction earlier this year. (Getty)

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