The 19-year-old academy graduate came through the ESTAC system from the age of eight and was a key figure in their promotion-winning campaign back to Ligue 1.
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In 27 appearances in all competitions, he scored four goals and registered seven assists, attracting significant interest across Europe.
Detourbet is expected to be loaned to AS Monaco, where a deal including a purchase option has been agreed. Transfer completes City's network strategy move.