PSG sporting director Leonardo joined Alex in addressing the media 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).

PSG later confirmed on their website that Alex had signed a two-and-a-half-year deal.