Sir David Attenborough has recovered from his surgery earlier this month and is set to complete his postponed tour of Australia.
The 87-year-old naturalist will travel Down Under next month after he had a pacemaker fitted.
Lateral Events, the company promoting the speaking tour, said in a statement that it was "pleased to announce that Sir David Attenborough has recovered well and has received the all clear to travel to Australia".
Sir David, whose groundbreaking programmes have included Blue Planet and Frozen Planet, recently narrated and presented the hit BBC1 series Africa.
The wildlife star said recently that he had no intention of doing less, saying: "I've been broadcasting for 60 years. I don't want to slow down. Retirement would be so boring."
Asked about his plans earlier this year, he said: "I'm going to China to see some very interesting fossils. In 2012, I went to the Galapagos, to Africa, north America and Australia.
"I've no idea how many days I was away."
Beyond natural history, Sir David, who collected fossils as a child and gained a natural sciences degree from Cambridge, has also enjoyed an influence as a broadcaster, introducing colour TV when he was controller of BBC2.
Britain's best-known natural history film-maker, whose early programmes included Zoo Quest in 1954, recently underwent a knee replacement.
He was knighted in 1985 and has also won a Royal Television Society Lifetime Achievement Award.