South Africa's former leader Nelson Mandela has been admitted to hospital in the capital Pretoria to undergo tests, officials say.
Mr Mandela spent more than two decades in jail under the white minority apartheid regime.
He served as South Africa's first black president between 1994 and 1999, and received the Nobel Peace Prize in 1993.
Mr Mandela has rarely appeared in public since 2004, when he retired from public life.
In January 2011 he was treated for a serious chest infection, and a year later underwent a diagnostic procedure for an abdominal problem.
Officials said on Saturday that he would need medical attention "from time to time" because of his age.
Mr Zuma said in a statement: "We wish Madiba [Mandela] all the best.
"The medical team is assured of our support as they look after and ensure the comfort of our beloved founding president of a free and democratic South Africa."