The Mean Girls actor sparked rumours she was thinking about switching faiths after she was spotted with the Islamic holy book during her community service in New York.
She has told the Sun she is studying Islam but has no plans to convert.
"I'm a very spiritual person and I'm really open to learning," she told the newspaper.
"America has portrayed holding a Koran in such a different way to what it actually is.
"We all believe in something and at the end of the day it all ties to a god or a spiritual adviser."
"We all have a similar belief in whatever it may be personally.
"My sister is Buddhist but she is still interested in learning other things from me. It's good to be open-minded."
Lindsay Lohan recently attended the 2016 British Asian Awards at The Grosvenor House Hotel in London.