By Simon Mullock Erik ten Hag has been urging Manchester United’s beleaguered players not to listen to the critics who have written them off as no-hopers. Old Trafford insiders believe the Dutchman is trying to build a siege mentality ahead of the visit of Premier League title-chasers Liverpool in the aftermath of United’s dramatic injury-time surrender at Chelsea on Thursday night. But his defiant messages have raised some eyebrows in the dressing room, with Ten Hag continuing to complain that there is nothing wrong with his methods and that he has been given no support from the new regime be…