The Belgian youth international has penned a four-year deal at the Etihad Stadium and revealed that Roberto Mancini has been scouting him for a long time.
City have also agreed for the teenager's parents to move to Manchester and Bossaerts insists this was crucial in his decision to leave Belgium.
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"City have been keeping tabs on me for three years," he told Het Nieuwsblad.
"I have always turned them down, but their scouts kept on watching me. After lengthy negotiations and discussions with my family and agent, I have decided to accept their offer after all.
"There'll be a house available from July where my family will live as well. It's important for my development to have my parents around."
It is thought that City have beaten Premier League rivals such as Liverpool and Arsenal to the highly rated centre-back's signature.
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