Russell Goodway, the cabinet member for economy on Cardiff Council, told ITV Cymru Wales' Sharp End programme that Wales' largest local authority would also be struggling to balance the books after cuts to funding in the Welsh Government's Draft Budget.
He said: "We employ 10,000 full-time equivalent, excluding teachers. I doubt by the time we get to 2017 that half of those people will be working for the council."
More top news
It will stay largely cloudy tonight and there will be some further rain around, with central parts perhaps staying driest.
ITV Wales understands the reason for the inquiry call stems from concerns raised at the end of 2016 over a former healthcare support worker.
Plaid Cymru says the Welsh Government must 'show stronger leadership' over fire safety at Welsh tower blocks.