By Simon Mullock Erik ten Hag has revealed how he contacted Sebastien Haller on Sunday night to congratulate his former striker for scoring the goal that made Ivory Coast champions of Africa. The Manchester United boss worked with Haller at the start of his career in charge of Utrecht and later signed him for Ajax. And the Dutchman became a big source of personal support to the player when he was winning his battle with testicular cancer a couple of years ago. When the former West Ham forward scored the historic winner for Ivory Coast in their 2-1 victory over Nigeria in Abidjan, the Dutchman …