Erling Haaland thanked Mateo Kovacic for a happy birthday song as he shared footage of the Croat singing his initiation song on his social media.
The City team are currently in Japan for pre-season after their squad reunited following breaks for the summer, and will face J League side Yokohama FM in their first game of pre-season on Sunday.
As is tradition with many players when they join a new club, Kovacic used what appeared to be a team meal to perform his initiation song, giving his rendition of Steve Holy's 'Good Morning Beautiful'.