Eden Harzard will wear the No. 17 shirt for Chelsea next season, the club have confirmed.
The Belgian international completed a €22.8 million move to Stamford Bridge in June following an impressive start to his professional career at Lille.
The 21 year-old scored 36 goals in 147 appearances for Les Douges, helping them to a league and cup double in 2011.
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In addition to team success, Hazard also became the youngest player to win Ligue 1 player of the year in 2011 before securing the individual accolade for a second year running in 2012.
The club's most expensive summer acquisition, so far, will join the rest of the squad for their pre-season tour in America, along with other additions Kevin De Bruyne and Marko Marin, who have been handed the No.14 and No.21 shirts respectively.