Around 2,000 Tesco workers discovered their jobs were at risk after the supermarket giant disclosed the locations of 43 store closures.
Seven superstores and six Homeplus outlets, including branches in Morecame and Ormskirk, are among the unprofitable shops identified for closure by new chief executive Dave Lewis.
He announced the closure plan earlier this month as part of wider measures designed to revive the group’s fortunes in the wake of a disastrous 2014.
Tesco said that 2,000 staff are expected to be affected by the 43 closures and that it will begin consultations with all those workers affected.
Mr Lewis said: “The decision to close the stores has been exceptionally difficult to take. I recognise it will affect many hard-working colleagues, our customers and local communities.
“Our priority is to explain what this announcement means for our colleagues and, wherever possible, offer them alternative roles with Tesco.”
Usdaw union national officer Pauline Foulkes said: “This is devastating news for over 2,000 dedicated staff in the 43 Tesco stores across the UK, who have worked hard to make their shop viable during a difficult time for the company.
“We will now enter into full and meaningful consultation meetings on this proposal, where we will look closely at the company’s business case for the closures.
“Our priority is to maximise employment within Tesco, seek redeployment opportunities for members, where possible, and to keep job losses to a minimum.”
In addition to the shutting of shops, the group recently announced it would shelve plans for 49 new stores.