The Hanna star told DS that, despite persistent rumours linking her to the Lord of the Rings prequels, she will not be reuniting with her Lovely Bones director Peter Jackson for The Hobbit.
"I won't be able to do The Hobbit unfortunately," she said. "I would have been tied up for quite a long period of time and there's a lot of projects in the meantime that are also really interesting and I'd like to be a part of."
Asked if she will still follow the progress of Jackson's take on J.R.R. Tolkien's fantasy novel, the actress replied: "I went on to [Peter Jackson's] blog, they sent me the video. They did their first video a few weeks ago so I'm going to keep myself updated on it."
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Watch Saoirse Ronan discuss The Hobbit below: