Mokonyane appointed Nkosi as Member of the Executive Council (MEC) for Roads and Transport after the 2009 general election,[2][3] and moved him to the Infrastructure Development portfolio in a reshuffle announced on 2 November 2010.
[4] He remained MEC for Infrastructure Development until the next reshuffle in July 2012, when he was dropped from the Executive Council and instead appointed to head the Gauteng Gambling Board.
[7] On 27 June 2019, he was assigned as a member of the Portfolio Committee on International Relations and Cooperation.
[8] On 11 September that year, he was also elected as co-chairperson of the Joint Committee on Ethics and Members' Interests, alongside Lydia Moshodi of the National Council of Provinces.
[9] In April 2021, he became a member of the Committee for Section 194 Enquiry, established to evaluate Busisiwe Mkhwebane's fitness to hold office as the Public Protector.