The actress plays the brother of Texas Ranger John Reid in director Gore Verbinski's Western adventure.
The Luther star joins Liam Neeson and Dan Stevens in writer-director Scott Frank's upcoming crime thriller.
The British actresses are the top two contenders for this sought-after role in the upcoming Marvel Studios sequel.
John Lee Hancock is directing this story about how Mary Poppins author P.L. Travers reluctantly let Disney adapt her beloved novel.
The actress is in talks for the female lead starring opposite Armie Hammer and Johnny Depp.