President Cyril Ramaphosa on Tuesday announced the appointment of Silas Ramaite as South Africa's acting prosecutions boss following Monday's Constitutional Court judgment which found Shaun Abrahams's appointment to the post invalid.

"While the President is studying the judgment, he is committed to appointing a permanent NDPP [national director of public prosecutions] well within the 90 days given by the Constitutional Court for such an appointment to be made," the presidency said in a statement.

"In the interim, President Ramaphosa has appointed Dr Ramaite as Acting National Director of Public Prosecutions."

Ramaite has been deputy national director of public prosecutions since 2003. His responsibilities include administration and running the Office for Witness Protection.