The NRL has brought in one of Australia's leading biochemical and weapons experts to ensure the season resumes at a NSW site expected to be one of the safest in the country from COVID-19.

While the identity of the consultant has been kept secret, the Herald has been told by sources familiar with the Project Apollo working party the specialist will play a leading role in drafting crucial biosecurity plans to be tabled this week.

The expert has previously liaised with the Australian army, police and fire brigade and will have a significant say on whether the NRL season can resume on May 28.

They will be used in tandem with the NRL's viral disease specialists, who will continue to counsel the code on Australia's COVID-19 infection rate.