Mr Ramaphosa is in line to take over from President Jacob Zuma as the ruling party's leader, but faces strong challenge from outgoing Africa Union Commission chairperson Nkosazana Dlamini-Zuma.
"A leader that is capable of uniting the movement, the ANC-led alliance and a leader that is comfortable working with the working class leadership".
This is despite the party saying the union federation had jumped the gun by making statements on the party's hotly contested leadership race set to come to a head during the ANC's 54 national elective conference in December 2017.
"The ANC does not meddle in the election of leadership of Cosatu and its affiliates", the party said in a November 18 statement.
And today the National Union of Metal Workers of South Africa slammed Cosatu's backing of Ramaphosa.
No one has declared an ambition to run but informal positioning is well under way, with the ANC split between backers of Ramaphosa, a former anti-apartheid leader popular with investors, and those who feel he would be too pro-business.
Worker federation Cosatu has announced its endorsement for deputy president Cyril Ramaphosa as the next president of the party.
Numsa said that an ANC government led by Ramaphosa would be no better than the current Zuma-led government.
"It (the ANC) will continue to consolidate the power of the white monopoly capitalism and to reassure credit ratings that South Africa is a good place to invest and exploit our natural resources and cheap labour", said Numsa general secretary Irvin Jim.
The ANC's dominance of South Africa since apartheid's demise means it is widely expected to win the 2019 election, making its next leader nearly certain to become president.
Cosatu General Secretary Bheki Ntshalintshali confirmed this at the trade union federation's press briefing following a three day Central Executive Committee (CEC) meeting.
However, Matuba said they were still waiting for ANC processes where they would be able to lobby on the "proper platforms" of the organisation.
"Next year we will be launching our programme on the women who will be ready to lead the country... if women lead, the poverty, unemployment, inequality and gender based violence would be reduced", she said. The inquiry into Phiyega had been completed by the Claassen commission, with Zuma expected to receive the report before the end of this year.