The main Adidas website remains offline after the company was targeted by what it describes as a sophisticated criminal cyber attack.
The German sportswear company said there was no evidence any consumer data had been affected by the attack discovered on 3 November, according to the BBC.
However, Adidas took the precaution of taking its website content offline to put in additional data security measures.
Most regional websites are back online, but the main Adidas.com site was still down early Monday. A note on the site said:" Due to technical difficulties, our website is currently not available.
"We apologise for any inconveniences caused and thank you for your understanding."
The news of the attack on Adidas comes just days after security researchers revealed that a China-based industrial espionage hacker attack targeted at least 29 chemical industry firms in July and September.
The researchers uncovered evidence that 19 other defence-related firms, including five in the UK, had also been targeted.
A key focus of the soon-to-be-released UK cyber security strategy will be blocking intellectual property theft through cyber attacks, which is becoming increasingly common.