Uncharted 4: A Thief's End will "most likely be Naughty Dog's last game in the series," lead multiplayer designer Robert Cogburn has said.
Speaking to GameSpot, Cogburn cast doubt on the developer ever returning to the franchise in the future, explaining that "we as a studio feel that this will probably be the last Uncharted game. Who knows?"
Cogburn's comments follow those from Uncharted's lead actor Nolan North last year, who said that he believed A Thief's End would be the last game in the series.
"It's bittersweet but at a certain point you want to go out on top," North told IGN. "If this is the last one indeed, and I believe it's the last one - nothing's confirmed, but I believe it's the last one Naughty Dog wants to do, in which case I hope somebody else doesn't pick up the mantle because they've done it so well for so long - but yeah, it's one of those things where you just have to cross that bridge when you get to it.
"I like the idea of going out on top so we better do a hell of a job with this one... and it's already looking pretty good."
Lead designer Kurt Margenau has also stated that the game will be "Nathan Drake's final chapter".
Neither Naughty Dog or Sony has yet confirmed plans for the series beyond Uncharted 4, which arrives on PS4 next March. The studio is, however, rumoured to be planning a sequel to The Last of Us.
"We have no confirmed information for the sequel [to The Last of Us]," Sony's head of Worldwide Studios Shuhei Yoshida said last month. "But, like many people, we wish to see what it's going to be like, how the story's going to develop, what life these characters have after what happened in The Last of Us."
Uncharted 4: A Thief's End launches exclusively on PS4 on March 18, 2016.