But the National Disability Insurance Agency has hit back at the claims, insisting its plans were in accordance with the health directions and government requirements.

It comes as Victoria recorded a further eight deaths on Tuesday, bringing the state's death total to 424 during the current outbreak.

It is alleged the National Disability Insurance Agency planned a morning tea event on November 8, inviting more than 900 agency staff to attend and listen to an address by chief executive Martin Hoffman.

According to the workplace directions in effect during the tearoom event and applicable to the agency's office space, gatherings should have been limited to a maximum of 200 and face masks were a requirement.

Around 100 staff are believed to have attended the Monday morning event with many not wearing face coverings, the Community and Public Sector Union has alleged.

The public sector union has lashed the government agency for its "tone deaf" planning of a large event without consideration for the safety of its workers.

It has also referred the possible breach to workplace inspector, Comcare, for investigation.

An agency spokesperson insisted attendance was optional and restricted those on site on the day.

"A calendar invite was sent to all staff who work from the location, however, numbers were limited to those working from the office on that day, attendance was optional and staff wore masks, in line with Victorian government restrictions," a spokesperson said.

"It is expected that all NDIA staff follow COVID-safe practices at all times while on site."

But CPSU deputy secretary Beth Vincent-Pietsch said hosting a possible 1000-person event was wildly inappropriate given the COVID situation in Victoria was continuing to record hundreds of positive cases daily.

"Not only has the NDIA failed to prepare state or site COVID-19 plans, but it has breached Victorian restrictions and put an entire site at risk by attempting to host a 900-plus event," she said.

"It is shocking that the CEO Martin Hoffman thought that it was appropriate to break COVID restrictions and invite over 900 people to a lunchroom to hear from him.

"It is wildly inappropriate and honestly tone deaf. Nothing should be more important than the health and safety of its clients and workforce."

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The union has also criticised the agency's COVID safety and return-to-work plans as being too broad and failing to take into account workers with disabilities or those working in high-risk settings.

A spokesperson for the NDIA has also said: "It is incorrect to suggest the NDIA does not have a transition plan in place for return to workplaces."

"The NDIA has a COVID-safe plan that has been based on relevant health directions, advice and guidelines and has been revised regularly in accordance with government requirements.

"The NDIA will manage a safe and gradual return to offices from November 2021 to January 2022, in line with relevant state health directions."

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