The 19-year old, whose brother Eden has recently signed for the Blues, has signed at Stamford BridgeChelsea have secured the signing of Eden Hazard's younger brother Thorgan from RC Lens.
The 19-year-old joins his older brother Eden at Stamford Bridge after completing his move from the Ligue 2 outfit, and plays in a similar position to his sibling, an attack minded midfielder. Eden completed a move earlier in the summer for around £32 million.
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However, he is a Belgian youth international after representing his nation at Under-16, Under-17, Under-18 and Under-19 level, and played at the 2011 European Under-19 Championship.
A loan move is a possibility for the young winger in order to get some first-team football, which would be unlikely given Chelsea's strength in depth.
For the time being, however, he will slot into the Chelsea Under-21 squad as they continue their pre-season training, while the senior squad is on tour in America.