SAINSBURY'S has said it is experiencing “technical issues” at some stores meaning it will not be able to fulfil the “vast majority” of online grocery deliveries.

The supermarket chain said on Saturday morning it was “working hard to fix the issue” and apologised to customers affected.

There have been problems with contactless payments due to an error with an overnight software update, although all stores were open as usual and chip and pin and cash transactions were working, a spokesperson told the PA news agency.

READ MORE: ScotRail managers to go on strike over working arrangements

A statement said: “We’re experiencing technical issues affecting some stores, our Groceries Online service and our ability to contact customers.

“Unfortunately, we will not be able to fulfil the vast majority of today’s Groceries Online deliveries.

“We are working hard to fix the issue and apologise to our customers for the inconvenience.

“We will contact customers proactively to rebook orders as soon as we can.”