Montsitsi replaces Jerry Thibedi, who was recently moved to the post of chairman of the portfolio committee on land reform and rural development.
ANC secretary general Gwede Mantashe said Arthur Moloto would become chairman of the standing committee on the Auditor General, and Aubrey Mokoena the whip of that committee.
Moloto has been the whip for the committee as well as the portfolio committee on energy.
Shepherd Mayatula becomes the whip for the portfolio committee on international relations, and Nthabiseng Khunou the whip for the portfolio committee on social development.
Mantashe announced the appointments during the ANC’s caucus meeting on Thursday.