Why Chelsea need more than a new goalkeeper to be title challengers

Martinez made his Chelsea debut having completed just one full training session [Getty Images]Just five hours after having his much-anticipated signing confirmed by Chelsea, Emiliano Martinez was walking out at Stamford Bridge to play for his new team against Brighton.Having been thrown straight into the starting XI by manager Xabi Alonso, however, it quickly became clear that he alone cannot solve their defensive problems.The 33-year-old said he was "fit and ready" to play despite his £7.