A young surfer who was attacked by a three-metre-long great white shark has revealed his leg was unable to be saved.

Kai McKenzie’s suffered serious injuries to his right leg at North Shore Beach in Port Macquarie last Tuesday.

An off-duty police officer who was on the beach with his dog rushed to help McKenzie and used his dog’s leash as a makeshift tourniquet to stop the bleeding on the surfer’s leg.

Kai McKenzie suffered serious injuries to his right leg after a shark attack.
Kai McKenzie suffered serious injuries to his right leg after a shark attack. (Instagram)

After the ordeal, the surfer was treated by paramedics and flown to John Hunter Hospital for treatment.

He has since been surrounded by support and has not lost his sense of humour after the attack.

“Spot something missing?” he wrote on Instagram on Monday morning.

Kai McKenzie suffered serious injuries to his right leg after a shark attack.
Kai McKenzie suffered serious injuries to his right leg after a shark attack. (9News)

“So good to have so many amazing people behind me.”

In another social media post over the weekend, McKenzie once again expressed his gratitude.

“To be here right now just to f–-king be able to hold my beautiful Eve and my family is everything to me,” he said.

“A few days ago I went through a crazy shark attack, biggest shark I’ve ever seen, which was a very crazy scene and scared the living f–k out of me.

“But to all you f–king kind hearted people, all you legends, to anyone and everyone all your support has meant the absolute world to me. 

“It’s so cool to see so many beautiful people support me.”

“I can tell you now if you know my personality this means f–k all. 

“I’ll be back in that water In no time, big f–k off to that shark and big thanks to Steve for saving my life.”

An online fundraiser has raised more than $160,000 to support McKenzie’s rehabilitation and recovery as of Monday morning.

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