Tesco says that 1,600 jobs are at risk as it announces a further round of restructuring across its store network.
According to a Sky News report, Britain's biggest supermarket says that it is moving overnight re-stocking to the daytime in 36 large stores and 49 convenience stores.
It is also converting 36 of its petrol stations to become pay-at-pump only sites during overnight hours.
The announcement comes a day after Tesco said it was scrapping its discount store brand Jack's with the closure of seven stores and the loss of around 130 jobs, while also shutting meat, deli and fish counters at more than 300 sites.
It said that the combined result of the announcements would be to put around 1,600 roles at risk of redundancy across the business, but that it aimed to offer alternative roles to as many as possible, with 3,000 vacancies currently needing to be filled.
Tesco said the changes to overnight roles came after it found that by moving stock replenishment to daytime trading hours it could ensure more staff were on the shop floor to help customers at peak times.
A spokesperson for the supermarket said workers on the night shift were only informed of the changes to overnight roles on Monday evening, which was why the announcements were not made at the same time.