Japan is facing a shortage of Asahi products, including beer and bottled tea, as the drinks giant grapples with the impact of a major cyber-attack that has affected its operations in the country.
Most of the Asahi Group's factories in Japan have been at a standstill since Monday, after the attack hit its ordering and delivering systems.
Major Japanese retailers, including 7-Eleven and FamilyMart, have now warned customers to expect shortages of Asahi products.
In a statement on Friday, Asahi said it was unable to provide a clear timeline for recovery but had started partial manual processing of orders and shipments.
Asahi is the biggest brewer in Japan, but it also makes soft drinks and food products, as well as supplying own-brand goods to other retailers. It owns Fullers in the UK and global brands including Peroni, Pilsner Urquell and Grolsch. However, Asahi has said that only its operations in Japan - which account for about half its sales - have been affected by the attack.
In its latest statement, Asahi said that due to containment measures following the attack, ordering and shipment systems in Japan had been disrupted and it was also unable to receive emails from external sources.
Although system-based order and shipment processes remain suspended, ensuring product supply to customers has been set as our top priority, it stated.
Atsushi Katsuki, Asahi president and group chief executive, has apologized for the disruption and assured that efforts are being made to restore operations swiftly.
In a statement, FamilyMart announced that its Famimaru range of bottled teas, produced by Asahi, was expected to be in short supply or out of stock.
7-Eleven has halted shipments across Japan of Asahi products, including its popular Super Dry beer, while other retailers like Lawson and Life Cooperation have warned of similar shortages.
The chain's plans to stock alternative products aim to alleviate customer disruption during this time.
Additional reporting by Chika Nakayama in Tokyo
