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Universal Pictures had initially planned to release the latest instalment this year, while producer Frank Marshall said in April that it was pushed back to summer 2011 and that a screenplay would be ready by June.
However, The Talented Mr Ripley star admitted that he is still to see a draft, Sci-Fi Wire reports.
He said: "None us have kind of seen [a script] yet, and Paul's [Greengrass] still cutting a movie that we worked on, so we'll get together and talk about it."
Damon added that he will only reprise his Jason Bourne role if the script is up to par, saying: "Oh yeah, we won't do it unless it's good. Promise."
The actor confirmed earlier that the screenplay will be based on an original concept.
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