https://www.chelseafc.com/news/latest-news/2015/08/squad-number-update.html
Squad number update
Fri 21 Aug 2015
Pedro will wear the Chelsea No.17 jersey and fellow new signing Baba
Rahman will now wear his preferred No.6.
Chelsea's squad list is now as follows:
1 – Asmir Begovic
2 – Branislav Ivanovic
4 – Cesc Fabregas
5 – Kurt Zouma
6 - Baba Rahman
7 – Ramires
8 – Oscar
9 – Radamel Falcao
10 – Eden Hazard
11 – Juan Cuadrado
12 – John Mikel Obi
13 – Thibaut Courtois
14 – Bertrand Traore
17 – Pedro
18 – Loic Remy
19 – Diego Costa
20 – Victor Moses
21 – Nemanja Matic
22 – Willian
24 – Gary Cahill
26 – John Terry
27 – Jamal Blackman
28 – Cesar Azpilicueta
29 – Nathaniel Chalobah
34 – Ola Aina
35 – Dominic Solanke
36 – Ruben Loftus-Cheek
37 – Jake Clarke-Salter