The Last Of Us 3 Not Ruled Out, But Director Hasn't Decided What's Next For Naughty Dog - GameSpot

With the imminent release of The Last of Us Part II, director Neil Druckmann is undecided on another sequel or something new.
The Last of Us Part II is an upcoming third-person action-adventure survival horror video game from Naughty Dog.

Naughty Dog Is Done With Uncharted And Might Not Make Last Of Us 3, Neil Druckmann Says - GameSpot

Asked about The Last of Us Part 3, Neil Druckmann says we have other projects in the works at Naughty Dog

News - June, 2013

The Last of Us, The Last of Us Wiki

Is Naughty Dog Teasing The Last of Us Part III With the 'New Single-Player Experience' Announcement? - EssentiallySports

The Last Of Us Part 3 accidentally confirmed by Naughty Dog boss, it seems

Everything that sucks! And some things that don't.

The Last of Us 3' future is up in the air, Naughty Dog says

The Last of Us Part 3 Might Not Be Naughty Dog's Next Big Game

The Last of Us 3: NAUGHTY DOG CONFIRMS NEW GAME IN WORKS #shorts

Joystick & Mouse

The Last of Us Part 2 Shouldn't Have Won

Naughty Dog has started its next game – probably isn't Last Of Us 3