Pep Guardiola, Ilkay Gundogan, Gabriel Jesus and Jill Scott were present at the partnership signing ceremony at the City Football Academy, with Manchester City Chief Executive Ferran Soriano pleased with the expansion of the Club's relationship with Nexen.
From next season the right sleeve of City's matchday shirt - will carry the name of Nexen Tire, a South Korean firm that is already one of the club's commercial partners.
Guardiola was joined by injured duo Ilkay Gundogan and Gabriel Jesus, who modelled shirts with the logo on them, as well as England global Jill Scott from City's women's team.
England women's worldwide Jill Scott was also at the unveiling representing City's women's team.
"We are delighted to continue our successful partnership with Nexen Tire", he said.
Nexen has been a partner of the two-time Premier League champions since 2015.
Manchester City have become the first team to announce a second kit sponsor, more impressively a sleeve sponsor, but other Premier League teams are expected to follow suit shortly.
The concept of a sponsored sleeve is by no means a novel idea and teams such as Santos in Brazil's top flight adopted the advertising ploy years ago.
Existing Club partner, Korean tire giant, Nexen Tire, has renewed its partnership with the Club and becomes the first brand to take advantage of the exciting new asset, which kicks in from the start of the 2017/18 Premier League campaign.
'At Manchester City, we are always striving to take an original approach to our commercial partnerships, creating great relationships and great content for our fans.
A rule change coming into force next season will allow clubs to have a secondary sponsor on their sleeves.