Targeting some of the country's most fashionable citizens, the first Italian store is planned to open in Milan by fall 2019.
Uniqlo revealed on Instagram that the athlete will wear special custom-made Uniqlo snowboarding outerwear in competitions, as well as the brand's LifeWear items.
While Fast Retailing Co’s Uniqlo brand clothes are a big hit outside Japan, overseas investors haven’t been drawn to its shares.
Uniqlo represented 80% of the turnover and the firm said it expected growth to continue at the brand, which now sponsors tennis stars Roger Federer and Kei Nishikori.
Fast Retailing is teaming up with logistics company Daifuku Co in a global strategic partnership aimed at delivering products faster to customers.
media reports have said the new deal would be worth around US$30 million a year, compared with the US$10 million a year agreement Federer had with Nike.
Fast Retailing's CFO Takeshi Okazaki says business is affected by weather more than economic conditions.
Federer, who wore a plain white bandana with two small red squares on the side while defeating Serbia's Dusan Lajovic 6-1 6-3 6-4 in the first round, said he was "excited" at being sponsored by the Japanese casual wear designer.
The 36-year-old's whites were missing the usual swish and the familiar RF emblem were gone after the 20-times grand slam champion ditched long-term kit supplier Nike in favour of Japan's Uniqlo brand.
Uniqlo issued a statement to confirm it had signed the Swiss as its global brand ambassador.