According to That Hashtag Show, showrunner Jane Goldman and casting director Lucinda Syson are looking at Atim and Gough for key roles in the upcoming series. Atim is an Olivier Award winning stage actor, and her role in the prequel would be one of six roles for actors of color. Gough, who voiced Yennefer in The Witcher 3: Wild Hunt, is being eyed for a role described as "critical" to the series.
The website reports that Atim and Gough have not officially joined the production, but they are said to be in the negotiations. If cast, they would join Naomi Watts and Josh Whitehouse, who are already signed on to star in the show. The report also mentioned that Black Panther star Letitia Wright rejected one of the five other roles for people of color.
The prequel will be set thousands of years before the events of the ongoing HBO series. Martin revealed that the pilot has also been written by Goldman, who co-wrote scripts for the Kingsman film franchise. Filming reportedly begins in February.
Game of Thrones will return for its eighth and final season in 2019. The HBO drama stars Peter Dinklage as Tyrion Lannister, Nikolaj Coster-Waldau as Jaime Lannister, Lena Headey as Cersei Lannister, Emilia Clarke as Daenerys Targaryen and Kit Harington as Jon Snow.