Zuma, who's due to deliver the state-of-the-nation address on Thursday (Friday NZT), defied calls by the top six leaders to resign at a meeting on Sunday, according to five senior party officials who spoke on condition of anonymity.
Meanwhile, the Nelson Mandela Foundation has called for South Africa's controversial President Zuma to quit as he faces growing pressure to stand down.
Either way this latest development has done nothing to dampen speculation in South Africa that Mr Zuma's time as president is nearly up.
Although the ANC is yet to comment on the meeting, insiders said the ruling party's NWC had chose to take the matter back to the National Executive Committee, which has decision-making powers.
The embarrassing decision to postpone Thursday's speech, a major event in which the president lays out a national agenda, added to the momentum against Zuma, an astute political operator who appeared to be running out of options after years of fending off allegations of wrongdoing.
Zuma's 10-year tenure has been marked by long-standing, mounting corruption scandals - he faces the prospect of prosecution for 783 counts of corruption, after the nation's prosecuting authority now deliberates whether to reinstate the dismissed charges.
"What we are hoping for is that the NEC (national executive committee) will emerge with a united view on this matter and that once we have done so we will inform South Africans what that view is".
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"We are not going to discuss the outcome with you because we don't know what the outcome will be, " she said.
Mr Zuma, 75, was replaced as party leader by his deputy, Cyril Ramaphosa, 65, in December.
Previous State of Nation addresses by Mr Zuma have seen an outpouring of anger by his critics.
Mr Zuma, who spent time in prison for his part in the fight against apartheid, met the ANC's top six on Sunday. It's time for the ANC [African National Congress].
Zuma has not said whether he will step down voluntarily before his second term as president ends next year. The embattled president also told the ANC leadership pushing him out would create serious divisions within the party because "people still loved him".
Mr Zuma could leave office either by resigning, through losing a vote of no-confidence in parliament or impeachment proceedings.
The expert in parliamentary issues indicated the head of the legislative organ has no power to postpone the speech of President Zuma before the joint session of the National Assembly and the National Council of Provinces announced for February 8.