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Warner Bros. may have already cast the major roles in the “Harry Potter” spinoff, “Fantastic Beasts and Where to Find Them,” but the studio is still on the lookout for another young star.

Warners is holding an open casting call for girls between the ages of 8 and 12 to play Modesty, a “haunted young girl with an inner strength and stillness,” the studio said. Modesty has “an ability to see deep into people and understand them.”

Auditions are being held at 9 a.m. Saturday in London’s Excel Centre Hall. Applicants must be available for shooting dates between August and January.

The “Fantastic Beasts” cast already has fans buzzing, with Oscar winner Eddie Redmayne starring as Newt Scamander, Ezra Miller (“The Perks of Being a Wallflower”) as Kredan, Katherine Waterston (“Boardwalk Empire”) as Porpentina, Dan Folger as Jacob and Alison Sudol as Queenie.

David Yates is directing “Fantastic Beasts,” which is set to bow on Nov. 18, 2016.