The Brazil international completed a return to Stamford Bridge from Paris Saint-Germain on transfer deadline day, while Marcos Alonso also moved to the Blues from Fiorentina.
David Luiz has been handed the No. 30 shirt after completing his return to Chelsea from Paris Saint-Germain.
The Brazil international moved to Stamford Bridge on Wednesday's transfer deadline day for 38 million pounds ($50M), only two years after leaving the Blues to join the French champions.
Luiz held the No. 4 shirt in his first spell at Chelsea but was unable to reclaim the same jersey, with Cesc Fabregas the current incumbent.