When they picture a messiah, few perhaps imagine a mild-mannered 51-year-old with a greying beard who used to play at left-back for York City. Certainly Chelsea and West Ham fans don’t. But the degree to which Graham Potter is loved in Sweden has to be seen to be believed. He was a down-on-his-luck manager seeking a new start; they were a country who didn’t win a single game in World Cup qualifying.