The summer arrival from Leicester City takes up the No. 7 jersey vacated by Ramires in January, the same shirt France head coach Didier Deschamps wore during the 1999-2000 season.
Chelsea has confirmed that new signing N'Golo Kante will wear the No. 7 shirt next season.
The defensive midfielder takes up the squad number Ramires vacated in January following his move to Jiangsu Suning.
In the Premier League era, the likes of Adrian Mutu, loanee Maniche and Andriy Schevchenko have all donned No. 7 while playing for the club.
Didier Deschamps, also a defensive midfielder during his playing days, wore No.