A former NSW MP has called on the Labor Party to clean up branches in the Illawarra ahead of the scheduled Wollongong by-election in November.

The by-election was brought on by the resignation of sitting member Noreen Hay last week after 13 years in office.

Ms Hay resigned on her own terms after being cleared of any wrongdoing in relation to recent allegations of electoral fraud and the 2008 ICAC investigation into corruption at Wollongong City Council.

Colin Markham, ALP Member for Wollongong prior to Noreen Hay, has written to the general secretary of the party Kaila Murmain in a letter obtained by the ABC.

Mr Markham said during the pre-selection process for the seat in 2014 "doctored minutes and dodgy attendance books" were presented and the Mt Keira Branch of the party was closed down, but he was not aware any investigations were undertaken to find the branch officials responsible.

He has called for a "full and thorough review of the records of branches in the Illawarra" to restore integrity to the party before the Wollongong by-election takes place.

"I just want to make sure that people who supposedly will have a right to vote have met all the criteria that the party lays down," he said.

Meanwhile a second ALP member has announced their intention to nominate as a candidate.

Paul Scully works at the Australian Institute of Innovative Materials at the University of Wollongong and said he had the skills, experience and energy to be a credible candidate.

Mr Scully unsuccessfully ran for ALP pre-selection against Ms Hay in 2014.

"I think it gave branch members a good opportunity to have a look at me, have a look at what I stand for, and I think things will be different this time," he said.

Wollongong lawyer Deb Langton has also announced her intention to run for pre-selection.