The ruling FijiFirst Party is expected to submit clarification on its list of donors against receipt books and bank statements it has already sent to the Elections Office.
The Supervisor of Elections and Registrar of Political Parties said he has completed stage one of the verification exercise on the FijiFirst.
Mohammed Saneem said he has also "referred a few matters to the party for clarification" this week.
Meanwhile, Mr Saneem said the opposition National Federation Party (NFP) has re-submitted its donor lists as requested by his office.
Mr Saneem said the NFP had also responded to queries he raised with the party last month.
For the Social Democratic Liberal Party (SODELPA), he said verification of its donor lists for the party was underway.
Mr Saneem said for the Labour Party, the initial verification of the donor lists had been completed and he had referred some matters from 2015, 2016 and 2017 to the party for clarification.