Ten days ago George revealed he had been taken to hospital after feeling unwell and that is when issues with his heart were discovered.
On Saturday, George called his new pacemaker his “little friend” and described it as “the best Christmas present I could’ve ever wished for”.
The singer said the operation took around two and a half hours.
“The main issue being some of my veins had collapsed where the wires were meant to go… But the surgeons and nurses at the NHS have been incredible. I owe everything to them.”
He said the pacemaker’s position underneath his tattoo tribute to Tom Parker made him “sure it’s being looked after”.
George said he was undergoing a few more tests due to inflamed lymph nodes on his lungs but had been hopeful he would be home for Christmas.
He continued: “Time to rest and then tackle life full on once again.
“Thank you for all your support. It’s meant a hell of a lot to myself and my family.”