The group is canceling the Australian and New Zealand leg of their tour.
"Fleetwood Mac, who has just completed the European leg of their phenomenally successful worldwide tour, has announced the cancellation of their upcoming 14 date tour of Australia and New Zealand," the group said Sunday in a statement posted on Facebook.
"John McVie, one of the co-founding and original members of Fleetwood Mac is now scheduled to be in treatment for cancer during that period of time," the statement continued. "We are sorry to not be able to play these Australian and New Zealand dates. We hope our Australian and New Zealand fans as well as Fleetwood Mac fans everywhere will join us in wishing John and his family all the best."
The band went on tour this year after releasing their first new material in April since 2003's "Say You Will," Billboard magazine said.