Neither CBS Television in Los Angeles nor producer-writer Stephen J. Cannell Production's office would confirm the information about the actors for the hour-long pilot that will begin filming on Oahu March 19.
However, sources said Zulu, Kam Fong and James MacArthur have all been contacted in the past few days about taking roles in the pilot, which will be aired in May.
Zulu played Kono, Fong played Chin Ho Kelly and MacArthur portrayed Detective Danny Williams in the original series that ran from 1968 to 1980.
Jack Lord, who starred as Steve McGarrett, the steely-jawed head of "Five-0," is too ill to appear even in a cameo role, sources say.
The original script for the pilot, which Cannell wrote, is being reworked to leave Lord out.
Zulu, whose real name is Gilbert Kauhi and who lives on the Big Island, and Fong, who lives in Honolulu, were contacted during the weekend by the show's casting department.
Sources say Williams' character will be promoted to attorney general and not governor as had been considered.
Zulu said he is thrilled for what he called "a most unlikely resurrection."
And Fong, who is more than 70 years old, and whose character was killed off when he decided to leave the show, said he would love to do the pilot because "I need something to do."
Other "Five-0" regulars, including Herman Wedemeyer, Harry Endo and Moe Keale, are also being considered for the pilot, sources say.
As to who will get the McGarrett role, CBS and Cannell aren't saying.
One rumor among the "Five-0" acting community is that Burt Reynolds and James Brolin are being considered for the part.