ASDA will not be making any staff redundant at its post office in Ellesmere Port, although some workers could be moved within the company.
The supermarket wants to make the department more effective but says the review will not affect the service it provides or the number of staff at its counters.
An Asda spokesman said: “We are not making any redundancies but we are having an analysis of hours in order to make the department more efficient.
“This will not impact on the service we provide for our customers.”
A Royal Mail spokeswoman said: “Staff are employed by Asda who run, manage and operate the sub-branch on be half of Post Office Ltd.”
Back in February 2006 Post Office Ltd confirmed the town centre’s main branch in Marina Walk would close with a new office built in the relocated Asda store which opened later that year.
The decision angered members of the public as well as borough MP Andrew Miller and several borough councillors.
At a heated public meeting a trade union chief called for people to boycott the new Asda store in a bid to save the main post office from the axe.
Post Office Ltd said the move was vital in order for them to remain financially viable.