The transfer is effective from July 1 and he will join up with our development squad at the start of the season.
Dorian made nine appearances for France Under-17s and played in all six of their European Under-17 Championship qualifiers in the 2004-05 season.
He stepped up into the Under-18s this year and played in recent internationals against Germany and Romania.
Sporting Director Damien Comolli commented: Ã¢â‚¬Å“Six foot four Dorian is a tall, strong defender with excellent technical skills. We believe he comes to us with enormous potential for the future.Ã¢â‚¬Â
We are delighted to announce the signing of France Under-18 captain Dorian Dervite from Lille.