Westpac has denied that a mass restructuring is underway with hundreds of jobs on the line.
First Union general secretary Robert Reid said he had received a tip that hundreds of Westpac staff faced losing their jobs "but the bank is still denying that it is large-scale".
"There [is] some restructuring and some redundancies we know that are happening in some of the branches and we're involved in that, but it's nowhere near the numbers that some media are mentioning.
"We have asked Westpac and they have denied some of the numbers being mentioned - 600, 700 or 800 - they have denied that there's anything like that either going on, or in the wind.