Naughty Dog is contemplating new ideas for a potential sequel or successor to The Last of Us, creative director Neil Druckmann has revealed.

Speaking with Eurogamer, Druckmann described how his creative team were pursuing new ideas following the upcoming release of The Last of Us’ sole story DLC, Left Behind.

“We have started brainstorming some stuff,” Druckmann said.

“To be honest, some of them are sequel ideas, and some of them are brand new IP – we’ve spent the last few weeks brainstorming new IP. So we have to get some good steps and see… It’s kind of like how we approached Left Behind. Can we tell people a story that’s really worth telling, and that’s not repeating itself? And if we can’t, where can we get inspired – what is something that’s really going to challenge us, and push storytelling in this medium forward?”

With over 3.4 million copies sold worldwide in its first three weeks, The Last of Us was the fastest selling title of 2013 and the fastest selling IP in the PlayStation 3’s history. Fans should note, however, that any new plans for the franchise won’t affect development of Uncharted 4 (which Naughty Dog teased in a recent trailer), as the Uncharted series is handled by a separate team.

Druckmann also went on to say that the possibility of a The Last of Us PlayStation 4 port, bundled with DLC and Sony’s new console, would be largely dependent on the developer’s “resources.”

Left Behind, which releases February 14, serves as a prequel to the events of The Last of Us and puts the player in the shoes of Ellie for the first time. It’s priced at $21.95 on PSN.