Whenever a team are struggling, they look to their most important players to lead the turnaround. For Liverpool over the past few seasons, that player has always been Mohamed Salah — the source of countless flashes of inspiration since he arrived on Merseyside in the summer of 2017. More recently, however, these moments have proved elusive. In the first leg of the Europa League quarter-final at home against Atalanta of Italy on April 11, Salah mistimed his run and had a ‘goal’ – which would have halved a 2-0 deficit – ruled out for offside; three days later, he had...