The retailer noted that it is due to the length of this current lockdown, potential systemic changes to consumer behaviour and the risk of further restrictions in future.
The update comes after Prime Minister Boris Johnson announced on Monday that non-essential retailers could potentially reopen on April 12.
The Sports Direct and Evans Cycles owner said the hit will concern freehold properties, other property, and plant and equipment in the next set of results.
It comes on top of the GBP125mln impairments reported in December’s interim results.
The firm ripped up its previous guidance of a healthy profit increase this year after it was forced to close most of its stores in the key Christmas period.
The whole estate was then closed in early January at the beginning of the current lockdown.