Arnold Schwarzenegger has declared he will be back at work just weeks after having a pacemaker fitted.

The 76-year-old actor - who has previously undergone three valve replacement surgeries - had another operation on his heart last week but 'The Terminator' star has revealed he's recovering well and is on schedule to start filming the second series of his TV series 'FUBAR' in April.

In a post on Instagram, he shared a picture of himself wearing a joke pacemaker emblazoned with the words "Danger High Voltage" and thanked fans for their well wishes. He wrote: "Thank you! I’ve gotten so many kind messages from all over the world."

He went on to give an update about his work schedule, adding: "A lot of people have asked if my pacemaker will cause any problems with 'FUBAR' Season 2. Absolutely not. I will be ready to film in April, and you can only see it if you’re really looking for it."

Arnold went public with his heart issues earlier this wee. During an episode of his 'Arnold's Pump Club' podcast, he revealed: "Last Monday, I had surgery to become a little bit more of a machine: I got a pacemaker...

"First of all, I want you to know I’m doing great! I had my surgery on Monday, and by Friday, I was already at a big environmental event with my friend and fellow fitness crusader Jane Fonda...

"I want to thank my whole team at the Cleveland Clinic. All of the doctors and nurses took amazing care of me and made the surgery as painless as possible."

The movie star added that was aware he was going to need the operation eventually, and had been having regular monitoring. He also confessed he had been struggling to cope with long working days prior to the surgery and insisted he's grateful to his doctors because he would be dead without their medical intervention.

Arnold said: "That’s life with a genetic heart issue. You won’t hear me complaining. My mother and her mother’s bicuspid valves killed them.

"I’m still here because of medical innovation and being very diligent about staying in touch with my doctors and listening to them."