At the peak of the BLM movement, Holding's emotional speech against the menace of racism in sports and society went viral on social media.
Ntini said he used to avoid travelling in the team bus and preferred running to the stadium to deal with the isolation.
Du Plessis acknowledged that his comment earlier this year, in which he had said the team did not see colour - when talking about Temba Bavuma being dropped from the Test team - was naive.
Ntini, Philander, Gibbs, Ashwell Prince, JP Duminy and Paul Adams were among the 30 cricketers who have signed the statement.
Earlier, CSA Director of Cricket Graeme Smith said that they will be discussing ways to express support for the Black Lives Matter movement.
During an interview, Michael Holding broke down while talking about his parents.
Former South Africa spinner Pat Symcox termed Ngidi's comments as 'nonesense'
Holding cited examples from history on how blacks were dehumanise through various events and it's something that should never be forgotten.
On Thursday, both England and West Indies cricketers kneeled before the start of their first Test match in Southampton showing support for the ongoing wave against racism across the world.
Joe Root hopes the gesture will go a long way in raising awareness against the menace of racism.