But Geldof is still hoping to persuade her to come on board for a comeback show in London's Hyde Park on 2 July.
He told UK TV show Richard and Judy that Mel B was working in California but also "has difficulty going back to something she did in the past".
He added: "I'll call her during the week and if she can't do it, she can't do it." '
Good girl, haven't the Africans suffered enough without being blamed for the reunion of the Spice Girls?
San Nakji for President!