The ANC on Monday denied claims that Blade Nzimande and Tony Yengeni swore at each other during the party's National Executive Committee (NEC) meeting last week.
The party said the allegations formed part of a malicious campaign aimed at damaging the organisation.
The party met to discuss former ANCYL leader Julius Malema's plea to have his expulsion from the party reviewed.
The ANC's National Disciplinary Committee (NDC) expelled him in April, after he told a gathering at the Wits University in March that Zuma had turned the ANC into an unbearable dictatorship.
Malema then approached the party's National Disciplinary Committee of Appeals, but failed to have the decision overturned.
Several reports emerged last week that Yengeni hurled the f-word at South African Communist Party (SACP) leader Nzimande.
Reports said Yengeni asked Nzimande "Who the f**k do you think you are?" during a heated debate at the meeting.
ANC spokesperson Keith Khoza said all reports about the clash emanated from one SMS. He said the claims were not a true reflection of the meeting.