Salim Mehajer, the embattled former deputy mayor of Auburn, has had two of his businesses placed under voluntary administration.

Documents lodged with the Australian Securities and Investments Commission (ASIC) reveal both companies - Sydney Project Group Pty Ltd and S.E.T. Services Pty Ltd - had administrators appointed by their board on June 16 over fears of insolvency.

The property developer appeared before the Supreme Court in Sydney on Thursday in a civil directions hearing relating to the appointment of administrators.

His sister Khadijeh Mehajer was listed as the second party in the case, which is due to return to court next week.