PSG sporting director Leonardo joined Alex in addressing the media on Friday afternoon in a press conference broadcast live by PSG TV.
The 29-year-old joined Chelsea in 2004 but has struggled for first-team football under Andre Villas-Boas this season and has now been reunited with former Blues boss Carlo Ancelotti.
French sports newspaper L'Equipe reported that the transfer fee was 5million euros (?4.18million).
Source: PA
Source: PA