South Africa's President Jacob Zuma should testify in front of a parliamentary committee on corruption if he's asked to, says the deputy president.

Cyril Ramaphosa says it is a "no brainer".

He told journalists that Nelson Mandela had set a precedent when he appeared in court in 1998 to answer questions on his decision to set up a commission investigating allegations of corruption and racism in rugby.

Mr Ramaphosa said "Nelson Mandela... sought to demonstrate that even if you're head of state and head of government you should never be above the law."

"Nelson Mandela was grilled, in parts it was very humiliating, but he went through with it," he added.

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