"Ryan Coogler is currently mapping out Black Panther’s sequel and has written in a number of new characters that movie-goers will be introduced to when it premieres," said the source, according to Metro. "One of those characters, if he gets his wish, will be played by Childish Gambino. Nothing is set in stone but 'informal talks' [are happening] between Ryan, Gambino and reps from Marvel and Disney to see if they can make it happen."
He's also reportedly in talks with his longtime collaborator, Michael B. Jordan, to return for the sequel as well.
"They’re still yet to decide if Michael B. Jordan will return in some capacity but if he doesn’t it’s likely Gambino may play some kind of villain," said the source.
If it happens, it wouldn't be the first time Glover played sort of villain in the Marvel universe. In Spider-Man: Homecoming, he had a small role as Aaron Davis, a career criminal who later becomes the Prowler in the comic books. Davis is also the uncle to Miles Morales, who Glover voices in the TV series, Ultimate Spider-Man.
As for Jordan, it's unlikely he'll return since he's assumed to be dead at the end of Black Panther. But this is the comic book world after all. Resurrection? NBD.