The classic band has scrapped a series of dates next year (14) to allow the bass player to take care of his health, and the unplanned hiatus means singer Nicks can shoot a cameo on one of her favourite shows, American Horror Story: Coven.
Creator Ryan Murphy has confirmed the Landslide hitmaker will play herself on the spooky drama after revealing she would be joining the cast for an episode, which is set to air next year (14).
However, he tells Entertainment Weekly the cameo almost didn't happen, because the singer's day job with Fleetwood Mac threatened to keep her from the set.
Murphy explains that her tour itinerary initially conflicted with the shooting schedule, but when the band was forced to cancel a string of dates so MCVie could undergo cancer treatment, Nicks became available.
He says, "She called and said, 'I'm now available, sadly enough, if you wanna use me'. So I said, 'Let's do it!' So she's flying in for, like, two days and doing her scenes. I know every person in the show is like, 'I better be in that goddamn scene!' It's funny."
Nicks, who is often namechecked on the show, is set to appear in the 10th episode of Coven's current season.