Lindsay Lohan won't be playing 1970s porn star Linda Lovelace in "Inferno."
Writer-director Matthew Wilder said his production team is in negotiations with another actress and will make an announcement soon.
"We have stuck by Lindsay very patiently for a long time with a lot of love and support," Wilder told E!. "Ultimately, the impossibility of insuring her -- and some other issues -- have made it impossible for us to go forward."
Some media reports said the 24-year-old starlet quit to focus on her court-ordered rehab for drug addiction; others said Wilder wanted her replaced.
The "Mean Girls" star is expected to be in rehab at the Betty Ford Center in California until at least Jan. 3.
The actress has become more of a tabloid mainstay than box office draw since a pair of high-profile arrests in 2007 led to a drug and drunken driving case. A judge last month ordered Lohan to rehab. It was her fifth time in court since May. The ruling allowed her to avoid a fourth trip to jail.