Asos hopes to resume trading as early as Monday as it counts the cost of a fire at its main distribution centre in South Yorkshire.
The online retailer was forced to shut its website after the blaze in Barnsley on Friday night.
South Yorkshire Police said they were treating the fire as deliberate and have launched a criminal inquiry.
Asos, which issued a severe profit warning three weeks ago, is expected to make a statement to the stock exchange on Monday.
People close to the situation refused to put a figure on the impact. However, they indicated that it was “not hugely material”.
There was no structural damage to the warehouse, they said, and the amount of stock damaged in the blaze was still being quantified.
When Asos’s then only warehouse was damaged by the explosion and fire at the Buncefield oil depot in Hertfordshire in 2005, the company made a £5.5m insurance claim. The site remained shut for a month then, with Asos’s shares suspended for several weeks.
The Asos website remained closed on Sunday after the Barnsley blaze, although it advised visitors that it hoped to be trading again “in the next day or so”.
The company was co-operating with the police investigation into the cause of the fire, people close to the situation said.
The blaze started at about 10pm on Friday night. At its height, the fire was tackled by crews from 10 fire engines and took more than 60 firefighters to bring under control. About 500 workers were evacuated.
The incident comes at a delicate time for Asos. Earlier this month, it said that pre-tax profit this year would be about 30 per cent lower than expected, after it suffered a “triple whammy of the perfect storm on profit”. It blamed the warning on a strong pound and heavy discounting.
But some rivals and analysts suggest there are fundamental changes in the online market, with bricks and mortar retailers becoming more assertive in their web operations, whereas previously Asos had a free rein.
In March, shares in Asos fell 20 per cent after the company reported slowing UK sales growth, lower than expected margins and increased losses from a push into China.
Nick Bubb, the independent retail analyst, said: “You would think it can’t possibly be as bad as the Buncefield disaster, and late-June isn’t the busiest time of the year.
“But back in 2005, Asos was quite small and the online industry was then in its infancy. Asos now has many more competitors and customer expectations on order delivery are much higher.”
Mr Bubb added: “The best-case scenario is that the business is quickly back in action, via temporary facilities nearby, and that the insurance companies settle up to cover the direct costs of the disruption.
“The worst-case scenario is that customer confidence is affected for a longer period of time and that the suspicion of arson delays the insurance companies’ response.”