The party's president Cyril Ramaphosa released a statement on Wednesday morning saying that Mabuza had requested a postponement of his swearing-in as a Member of Parliament today.
Many voters were also dismayed at the racial inequality that remains entrenched a generation since the former liberation movement took power.
"I will be a president for all South Africans and not just a president for the African National Congress", Ramaphosa said. But he has struggled to enact reforms in the face of opposition from party rivals.
The ANC's integrity commission has told Eyewitness News it will meet with deputy president David Mabuza and other ANC members flagged in its report next week to hear their side of the story.
ANC newly elected chief whip, Pamela Majodina, has hit the ground running to provide insight into speculation that Deputy President David Mabuza was dragging his feet to be sworn into parliament.
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"There were indications in the run up to this - that Mabuza won't be the deputy president of the country and won't serve on the executive".
"The Deputy President made the request in light of a report by the ANC Integrity Commission in which he is alleged to have prejudiced the integrity of the ANC and brought the organisation into disrepute".
Ramaphosa's ANC has 230 seats in South Africa's sixth democratic parliament since the fall of apartheid in 1994.
Political analyst, Imraan Buccus says the move is not surprising.
South Africa's economy grew an estimated 0.8 percent in 2018 after recovering from recession.