South African main opposition party has removed MP Ghaleb Cachalia from the coveted shadow cabinet over remarks he made on the Israel-Gaza war.

Mr Cachalia, who served as the shadow public enterprises minister for the Democratic Alliance (DA), is said to have violated the party's position on the conflict.

The party had appointed a spokesperson for the Israel-Gaza conflict and urged caucus members to refrain from making public statements that could divide or inflame the issue.

But on Tuesday Mr Cachalia tweeted: "I will not be silenced. Israel is committing genocide".

DA leader John Steenhuisen described the MP’s behaviour as "selfish and pursuing narrow self-interest above the common good", public broadcaster SABC reports.

Mr Cachalia in a statement confirms receiving the dismissal letter from the DA leader and says he will remain loyal to the party.

"I continue to keep a watchful eye on human rights abuses here and globally and I will always speak truth to power," he added.

He will be replaced by Mimmy Gondwe as the party's spokesperson on public enterprises.