Jude Law is attached to play young Dumbledore in the follow-up to last year's "Fantastic Beasts and Where to Find Them," while Redmayne is expected to return as Scamander, as is Johnny Depp, who played the dark wizard Gellert Grindelwald, reported Variety.
David Yates will also be back to direct the sequel. Rowling made her screenwriting debut on the first "Fantastic Beasts" and has returned to write the screenplay for the next installment.
Shooting is set to begin this summer for the as-yet- untitled film, which will arrive in theaters on November 16, 2018.