Multiple sources have confirmed that Chelsea have officially submitted a bid for Andrea Cambiaso. The offer for the Juventus defender had been speculated for a number of weeks, but represents the first concrete bid for the player. While negotiations continue, they are said to be progressing. Until a fee and conditions are finalised, the deal remains vulnerable to disruption - especially if Barcelona, Como and Man Utd decide to make a formal offer of their own in the coming days. Chelsea's back line has been a real strength this season, conceding just 1.15 goals per game (31 in 27). Andrea Cambiaso would be expected to slot into that unit and hold his own in an already solid setup. Juventus continue to be linked with Alex Meret, Brahim Diaz and Emilano Martinez while Chelsea are also rumoured to be tracking Diogo Costa, Yasin Abbas Ayari and Iliman Ndiaye. Can't get enough Chelsea transfer rumours? Follow @PlayerSwitchCom on Twitter for the latest transfer news as it happens.