Announcing Vieira's departure on their official website, New York City were quick to thank the former World Cup victor for his endeavours. He started as a coach of Manchester City's development squad before getting his first head coaching position in NY.
"Having the opportunity to be a head coach in NY is something many dream of", Vieira said.
He was briefly, if remotely, linked with the Arsenal job when Arsene Wenger announced his departure.
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"Patrick has been a fantastic role model at NYCFC and a true leader on and off the field".
Vieira's assistant coach Christian Lattanzio, performance coach Kristian Wilson and physical performance coach Matt Cook at NY will follow the Frenchman to Nice. His contract runs until the end of the 2020 season.
"Though I have enjoyed a wonderful 11 years working alongside my colleague and close friend Pep Guardiola - it has always been my ambition to manage a team again and I really couldn't have hoped for a better opportunity than at this football club", Torrent told NYCFC's official website.
"I know we have a very talented team, I have watched numerous matches and I enjoy the way the team plays and I now can't wait to begin working with the players on the training pitch". He also won 107 caps for France, winning the World Cup in 1998 and European Championship two years later.