On a day on which Victorian Premier Daniel Andrews declared a state of emergency in Victoria the NBL confirmed both United and the Phoenix will remain in lockdown.

Training was first suspended last week when United pair Mitch McCarron and Jo Lual-Acuil returned positive tests. Phoenix players and staff also remain in isolation and are undergoing testing.

"Our primary concern is the health and welfare of our players, staff and their families," commissioner Jeremy Loeliger said.

"This is a challenging time for everyone concerned and we are working closely with the clubs and the Australian Basketball Players' Association (ABPA) to provide support for all those affected.

"We are also working closely with the Department of Health and Human Services (DHHS) to manage the outbreak and limit any risk to the wider community."