By Dan Marsh Several Manchester United players have reported concerns over the running demands placed on them by Erik ten Hag. Ten Hag is under pressure after overseeing an underwhelming campaign and speculation over the Dutchman’s long-term future has dominated the narrative at Old Trafford in recent weeks. New part-owner Sir Jim Ratcliffe has failed to publicly endorse Ten Hag and it remains to be seen if the club will continue with him next year. The pressure was already on the former Ajax chief ahead of Sunday’s highly anticipated Manchester derby, which United lost 3-1. That defeat means …