"The risk is that those pro-choice people, which we do have a number of, if they choose to leave the organisation then obviously there is a resource issue for council – we could lose a number of people.
"We are going through the proper process at the moment, identifying risk and engaging with them, so we don't know how many would be in that situation. But we thought we'd highlight it as a risk."
Manley says staff vaccination rates could also affect the council's relationships with external organisations, customers and ratepayers.
"External organisations also expect us to be vaccinated. People coming into our public-facing places, like libraries, swimming pools, iSites, also expect us to be vaccinated.
"If we haven't got a very high level of vaccination within our staff then it could impact on our service delivery."
He says the council may also have to consider whether vaccination is required for councillors, as elected members are not employees.