Serkis will reprise his role as the mercenary Ulysses Klaue from "Avengers: Age of Ultron", while Freeman will once again play, Everett K Rose, the US State Department liason to foreign diplomats, following his debut in 2016's "Captain America: Civil War", reported AceShowbiz.
The two have joined the previously confirmed stars, Chadwick Boseman, Michael B Jordan, Sterling K Brown, Florence Kasumba, Lupita Nyong'o, Danai Gurira, Daniel Kaluuya, Winston Duke and Letitia Wright.
Directed by Ryan Coogler, the movie is currently filming in Atlanta and is set to hit the US theatres on February 16 next year.