Opposition Leader Matthew Guy and senior Liberal John Pesutto both insist they knew nothing of a workplace harassment payout by a former Napthine government MP in 2014, because the matter was settled privately.

Mr Guy said on Monday the complaint by a female staff member who worked for ex-MP Nick Kotsiras had nothing to do with the Liberal Party and never made it past former premier Denis Napthine's chief of staff.

Opposition Leader Matthew Guy Credit:AAP

The woman later worked as an adviser to Mr Guy.

Mr Guy said the complaint was handled privately after being raised with Dr Napthine's office.