Victorians with mental health issues may not fall through the cracks as they move to the National Disability Insurance Scheme with a state government spend.

Victorians with mental health issues who might have fallen through the cracks in the move to the National Disability Insurance Scheme have been given a $70 million state government backing.

Mental Health Minister Martin Foley announced on Friday that $70 million would be spent over two years to aid community mental health providers give psychosocial support to those with a severe mental illness who are not eligible for the NDIS or have not yet transitioned to the scheme.

Mr Foley blamed the federal government's "mishandling of the NDIS rollout" as the reason the state government needed to cough up cash.

"We won't sit by and watch Scott Morrison and his government put Victorians on sub-standard plans or abandon them altogether," he said.

Yet the NDIS was a project under former Labor leader Julia Gillard's leadership.

About 1800 plans for people with psychosocial disability have been initiated yet 4400 people have been approved plans, the state government said on Friday.

Under the spend, community mental health organisations will receive $50 million to deliver a new service and give mental health workers job security, while disability and community mental health agencies will be able to share in $20 million of grants.

Mental Health Victoria chief executive Angus Clelland welcomed the cash, saying it was an enhanced safety net and would secure hundreds of mental health jobs in Victoria.

"More investment in mental health is desperately needed during a period of transition and reform, and the Andrews Government's initial investment will help ensure people can receive appropriate supports and services," he said on Friday.

Mr Clelland called on the federal government to prioritise investment in community mental health services across the country.

The federal government has been approached for comment.