Striker Isaac Drogba, 17, has linked up with the top-flight French club's under-19 side after leaving Chelsea's academy.
His father posted a message on Instagram, which read: "Couldn't be more proud of you Isaac Drogba."
And two other Chelsea legends reacted to the news.
Frank Lampard wrote: "Congratulations! I remember Isaac as the small polite boy! Now a man!"
And ex-Blues captain John Terry said: "Can't believe how big he is mate, congratulations."
And Isaac could be a future England international.
Back in 2015, Drogba said: "I asked him which nationality do you want to play for,' father 36-year-old Didier explained.
"He's French, but he said he does not want to play for Ivory Coast or France, he wants to play for England."