Consumers “may never shop the same way again” after the coronavirus crisis, said the boss of Marks and Spencer.
The comments came as the retailer said sales of clothing and household goods fell 75% in the six weeks to May 9.
Food sales also fell 8.8%, although M&S said many of its Simply Food stores were trading strongly.
The update comes as M&S said profits for the year ending March had fallen by more than 20%.
Pre-tax profits fell to £ 403 million from £ 511 million the previous year as M&S struggling clothing business continued to struggle.
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Marks & Spencer is the subject of a transformation plan led by its CEO Steve Rowe.
But the coronavirus pandemic has created new problems for the High Street chain in the hopes of revising its business.
Last year’s results for the retailer also reflect its purchase of 50% of the retail business from online supermarket Ocado for £ 750 million.
Rowe said Ocado’s solid performance during the foreclosure “further enhanced” the value of the deal for the delivery of groceries.
The retailer will partner with Ocado from September this year, replacing the existing online grocer’s agreement with Waitrose.
M&S announced Wednesday that more than 1,000 non-food items, such as clothing and furnishings, will also be available for delivery through its merger with Ocado.
“The trauma of the Covid-19 crisis has galvanized our colleagues to secure the future of the business,” said Rowe.
“The digital trend has accelerated and changes in the shape of the main street have been highlighted. Above all, work habits have been transformed and we have discovered that we can work faster, lighter and more efficiently. “
Neil Wilson, chief market analyst at Markets.com, said: “Covid-19 has accelerated many consumer trends and it may well be the catalyst to accelerate the transformation of Marks and Spencer into a 21st century retailer.
“In particular, it seems like M&S has learned how important the web is – so it’s about making its Ocado business more central to the business. “
In recent years, the company has faced increasing competition from fashion giants such as Primark on the main street and Asos.
In the year ending March, M&S said clothing sales were down 6.2%, while food sales were up 1.9%.
To make matters worse, M&S ‘non-food stores were forced to close as part of the foreclosure measures.
As a result, he faces an “increasing backlog of unsold inventory” in his warehouses, he said.
The firm said the foreclosure measures, social distancing and declining consumer demand were “likely to continue throughout the year,” adding that the coronavirus pandemic means that its performance over the course of next year are difficult to predict.
He is working on a scenario that assumes a turnover of £ 2.1 billion over the next year for clothing, home, food and international sales.
Sophie Lund-Yates, equity analyst at Hargreaves Lansdown, said: “Overall, M&S was facing challenges before the coronavirus and these were simply exacerbated.
“In the difficulties, there are also real opportunities, and the group seems to have a lot of good ideas, but the next chapter must really be about execution. “