On the face of it this looks like the most basic piece of maths. Here is a move that can never be the wrong move. When life gives you lemons, sign Erling Haaland. When your squad doesn’t have a first-team player whose chief skill is scoring goals, sign Erling Haaland. When six years of careful team-building brings you a Champions League semi-final exit with 31 shots at goal: sign Erling Haaland.
