Woodard will be voicing the character of Sarabi, the mother of Simba while Kani will portray trusted royal adviser Rafiki, Entertainment Weekly reported.
Kani last starred in Captain America: Civil War and will next be seen in Black Panther.
The pair join a growing star-studded cast that includes James Earl Jones reprising his role as Mufasa, Donald Glover as Simba, Billy Eichner and Seth Rogen as Timon and Pumbaa and John Oliver as Zazu. Chiwetel Ejiofor is currently in talks to voice the villainous Scar.
Lion King is set to arrive in theaters July 18, 2019.