"Nelson Mandela was a towering symbol of resistance, a leader, an activist, and a man who recognised the power of sport to inspire and bring people together," Isaac said in his message.
"Mr Mandela never compromised his principles and his beliefs in justice and equality. As South Africa's first black President, Mr Mandela recognised and utilised sport as a mechanism to unite the divided people of South Africa and create a shared national identity and pride. As a statesman, he was remarkable, and as a man, he was inspirational." Richardson echoed the sentiment.
"This is extremely sad news not only for all those in my home country of South Africa, but around the world. Mr Mandela was celebrated for his unwavering dedication to human rights, equality and respect. "He was and will forever remain a true hero," he said.
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Earlier in the day, the Australian and England team, playing the second Ashes Test at Adelaide, showed their respect for Mandela. Boxing great Muhammad Ali spoke of what he learnt from Mandela while champion golfer Tiger Woods spoke of Mandela's influence in his life and career.
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Madiba, as Mandela was fondly known, had been battling health issues in recent months, including a recurring lung infection that led to numerous hospitalisations. Mandela, who emerged from prison after 27 years to lead South Africa out of decades of apartheid before becoming the country's first black leader, had faced several health scares.
His most recent hospital stay spanning over three months was his longest since he walked free in 1990. Mandela is respected worldwide for his role in fighting racism in South Africa, and for forgiving his former white captors after his release from prison.