A supermarket warehouse in Northamptonshire is set to close with the loss of 600 jobs.
Jobs are being transferred to a new depot at Lichfield
Tesco is moving its distribution depot at Crick to a purpose-built site near Lichfield in Staffordshire.
Workers are being told that they will be considered for positions at other sites and stores, or be offered redundancy packages.
The company is currently in talks with union representatives who want the depot to remain open.
New £63m site
Midland divisional officer of USDAW, Gary Holz, said if the depot had to close the union will negotiate redundancy packages and help find alternative employment in the area.
A Tesco spokesman said the Crick grocery depot faced planned closure by the end of September, subject to consultation with the unions.
He said: "Work and staff would transfer to a £63m purpose-built site at Fradley Park, near Lichfield, where 1,000 people would be employed.
"All Crick staff will be offered the opportunity to go to Fradley Park but it may be impractical for some.
"They will be considered for roles at other depots and also in our stores. Redundancy packages will be offered for remaining staff."