In the fullness of time Chelsea’s surrender against Brighton in April may be seen as the turning point. The humiliation accelerated Liam ­Rosenior’s demise and forced the Stamford Bridge hierarchy into a ­reckoning leading to the appointment of Xabi Alonso, a shift in ­transfer ­strategy, the birth of the JP Morgan front three and the end of ­Robert Sánchez’s time in goal.

For now, though, the argument that Emiliano Martínez is the final piece in the jigsaw seems a touch ­premature. With seven goals scored and five conceded while winning their first two league games, it is not hard to see where Chelsea need to improve in order to sustain a title challenge. They have to be savvier when ahead, and although the good has so far outweighed the bad Alonso could do with his side not dropping their guard when they have the ­opposition on the ropes.

Signing of World Cup winner adds to sense that this is the summer when BlueCo got serious in transfer market

Carlo Cudicini was a very good goalkeeper. However, José Mourinho was ruthless when he became Chelsea manager in 2004. Very good was not good enough. Mourinho wanted the best and one of the main factors behind the Portuguese winning the Premier League during his first season in charge was the decision to replace Cudicini with Petr Cech.

There is an old line about a great goalkeeper being worth 15 points a season. It is not for nothing, for instance, that Brian Clough regarded Peter Shilton as one of his most important signings at Nottingham Forest. Shilton was key when Forest defied the odds by winning the Division One title in 1978 and there are plenty of other examples of promising teams taking the next step only after buying a top No 1.