The £32 million summer signing has been handed Jose Boswinga's old number, as other new additions Kevin De Bruyne and Marko Marin are given No.14 and No.21 respectively
Eden Harzard will wear the No. 17 shirt for Chelsea next season, the club have confirmed.
The Belgian international completed a £32 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.