Liverpool should be getting to work as soon as possible for new players, even with the most recent season only just coming to an end. New boss Arne Slot will be identifying which areas of his squad need improving and which are suitable, at least for the time being. But one area that he must consider strengthening is at the back, with the Reds having endured a difficult defensive season last time out. Goalkeeper Alisson and his full-backs Trent Alexander-Arnold and Andy Robertson cannot be handed much of the blame given that they missed key parts of the season due to injury. Captain fantastic V…