Cillian Murphy, Jodie Comer, and Aaron Taylor-Johnson star in the sequel, directed by Danny Boyle.
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Its three films, of which two have been shot, Fiennes toldIndieWire.
And it centers on a young boy who wants to find a doctor to help his dying mother.

Ralph Fiennes.Stefania D’Alessandro/Getty
He leads his mother through this beautiful northern English terrain.
But of course, around them hiding in forests and hills and woods are the infected.
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Danny Boylewill return to direct, with a script co-written withAlex Garland, the same duo behind28 Days Later.
Murphy was also absent from that film.
Fiennes will next be seen inThe Return, releasing Dec. 6 this year, as Odysseus of Greek myth.