Westpac is warning 80 jobs are at risk as it reviews the operation of its mortgage processing centre at Lockleys in Adelaide.
The company said it was consulting staff and expected to make a final decision by the end of the month.
Paul Marriage of Westpac said it was working closely with staff on planned cutbacks.
"We employ 4,600 people in South Australia.
We'll continue to recruit and to hire in South Australia and where teams are affected as a result of the review here, we'll do our very best to make sure we redeploy where possible and to also help people retrain," he said.
"One of things that we're very keen to do is to redeploy wherever possible.
We've got a good track record on this.
Where we've had previous things like this, we've been able to redeploy about 36 per cent of staff affected, so certainly we'd want to redeploy as many of those staff as we can." Finance Sector Union official Deb Black said it was fighting to keep local jobs.
"We're not really confident that they will redeploy.
when they've done these sort of cuts their practice is not really to redeploy," she said.
"A significant number of jobs have been saved over the years.
Unfortunately it's a rolling program with this organisation, it's a cost-cutting exercise.
We're hoping that they listen to reason.
"We don't believe that there's a necessity to cut jobs." The union said Westpac planned to move 134 jobs to India and the Philippines and more than half of those were from SA.
Westpac also is reviewing other teams and says any changes will take effect from July.
Federal Labor MP and local member Steve Georganas said he had started an online petition calling on Westpac to stop sending jobs offshore.
"This has been an ongoing issue in my electorate.
Workers have been telling me that constantly jobs are being slashed and continuously going overseas for cheaper labour," he said.