The Madlanga Commission will listen to submissions from the Investigating Directorate Against Corruption's (IDAC) head Advocate Andrea Johnson.

The leadership and credibility of Investigating Directorate Against Corruption (IDAC) head Andrea Johnson is expected to come into scrutiny today when she appears at the Madlanga Commission on Tuesday.

Johnson's appearance comes after illness prevented her from testifying last week, delaying what is expected to be a closely watched session before the commission.

She arrives at the hearing under significant pressure, with the possibility of an inquiry into her fitness to hold office and a potential suspension looming over proceedings.

Her testimony follows evidence from senior IDAC officials who painted a troubling picture of the anti-corruption body, alleging it has been plagued by internal divisions, intimidation, corruption and conflicting agendas.