A COVID-19 case has been confirmed in a contractor who worked at Thales Bendigo last week.
Another staff member was tested and is isolating after coming into contact with the contractor.
A Thales spokesperson said the external contractor had worked in personal protective equipment at an isolated part of the Bendigo site, one day last week.
The Thales spokesperson said the business had taken steps including deep cleaning to mitigate risk to the workforce.
"No Thales employee has tested positive to COVID-19 at Bendigo," they said.
Thales had implemented a COVID-19 management plan to keep employees safe since March, the spokesperson said.
This included enhanced hygiene measures across all sites, temperature testing, staggerred shifts and breaks, closed canteens, expanded break rooms, they said.
Increased use of PPE, hand washing, increased cleaning, deep cleaning and a contractor management system were among other measures.
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