Joaquin Phoenix and Rooney Mara are all set to work together again, this time in director Lynne Ramsay's Polaris.

It is yet unclear as to what role Phoenix and Mara will play in the film. Joaquin and Rooney first starred together on screen in 2013's Her. Later, the duo also starred together in films like Mary Magdalene and Don't Worry, He Won't Get Far on Foot in 2018.

Speaking during the recent Valencia International Film Festival director Lynne Ramsay received the Luna de Valencia Award and spoke about her upcoming film Polaris, where she revealed that both Phoenix and Mara had been attached to the project.

When it came to Phoenix, Ramsay noted that he was the "best actor" that she'd ever met, and had a reason for everything he did.

"He's crazy, but he's the best actor I've ever met. Everything he does on the set has a reason," Ramsay said. "It's much more difficult when you come up with an original idea like this, but it's impossible not to get excited when you're preparing a movie with Joaquin."

Apart from this film together, both Rooney and Phoenix have several major individual projects lined up. Mara has been confirmed to be a part of Guillermo del Toro's Nightmare Alley and also Sarah Polley's literary adaptation Women Talking. Joaquin has been busy shooting for Ari Aster's Disappointment Blvd and also has a film with Ridley Scott lined up.

Source: Press Release