According to published reports, the directing job has already gone to Bourne screenwriter Tony Gilroy. And Damon has previously stated that he won't appear in a fourth Bourne film unless Liman's replacement, director Paul Greengrass, is involved as well.
Still despite those protestations to the contrary, Liman thinks Damon's final decision will rest with what's on the page.
"Matt and I are both script whores. We really are," Liman said. "Obviously there is a lot of money to be made on Bourne Identity for me and him. But all Matt cares about is that he believes it will be a good movie and that's why Matt is still so respected. [...] He is the opposite of a sellout. He is a self-proclaimed script whore. As am I."
Additional reporting done by Chloe Melas