Communications Minister Dina Pule may face a fine of a month's salary and a reprimand from Speaker of Parliament Max Sisulu if she is found guilty of misconduct by the parliamentary committee on ethics.
Pule is being investigated for irregular payments around the ICT Indaba organised by her department last year.
Her romantic partner, Phosane Mngqibisa, is alleged to have benefited from these payments.
The indaba’s main organiser, Carol Bouwer, also submitted an affidavit revealing to the committee that she was forced to hire him.
At the weekend, the Sunday Times reported that her department pressurised organisers to hire Mngqibisa's company to assist with the major event, for which he was reportedly paid at least R6-million.
According to the paper, a forensic report by law firm Werksmans confirmed that payment. The probe was conducted on behalf of MTN. The document also states that Mngqibisa could not explain how his company, Khemano Events, came up with the exorbitant amount for their service.
Pule is being investigated by the ethics committee, as well as Public Protector Thuli Madonsela.
But her spokesperson, Siya Qozo, said the minister welcomed the probes.
"The minister immediately welcomed the decisions [to probe her], and also encouraged all of the staff to cooperate with that process."
Pule stands accused of overseeing the use of government and sponsorship money to pay management fees of the event to her romantic partner.