Auckland's mayor Phil Goff is recovering in hospital after unplanned cardiac surgery.

Photo: RNZ / Claire Eastham-Farrelly

A spokesperson said the mayor had undergone angioplasty yesterday, and was not expected back at work for a week.

Mr Goff is expected to remain in Auckland Hospital for a couple more days.

He returned late last week from a short business trip to Hong Kong.

He is the second mayor of Auckland to have heart trouble. His predecessor Len Brown had several months off work after a heart attack at a public function 10 years ago, while in his previous role as mayor of Manukau.