Ruud Gullit was Chelsea manager in the late 1990s when he remarked that “a goalkeeper is a goalkeeper because he can’t play football”, so he would no doubt have been an interested spectator back at Stamford Bridge on Thursday when Chelsea made a big fanfare out of the arrival of Kepa Arrizabalaga, a record club signing at £71.6m and the most expensive net minder on the planet.

Should Arrizabalaga make a slow start in English football, like David de Gea, will he have the mental strength to recover or will he go the way of Liverpool’s Loris Karius? The same question can be asked, though perhaps not quite so forcefully, of Karius’ replacement at Liverpool, 25-year-old Alisson Becker, who was the world’s most expensive goalkeeper