As part of the deal Sané will appear in a television ad campaign for Sony’s Xperia XZ and Xperia Z X Compact mobile phones.
Sané will help Sony target the wider European market given the Premier League club's growing popularity as a result of new manager, Pep Guardiola, joining the club this season and the growing expectations of City with the Champions League.
Sané isn't the first footballer to sign with Sony to promote their brand. Last year Real Madrid and Wales international star Gareth Bale was the official brand ambassador for the Xperia range of phones.
Man City itself has garnered a reputation for partnering with tech brands as part of its efforts to drive innovation across sponsorships and strengthen its global fanbase.