By Samuel Meade Erik ten Hag has hinted that he’s “frustrated” with the Manchester United medical staff, who told him he’d have Luke Shaw and Tyrell Malacia back by January – only to be still without the pair. United’s backline has been decimated by injuries and the club have struggled to call upon a recognised left-back in recent months. Despite initially being told that Shaw and Malacia would be sidelined for a short period of time, those predictions appear to be way off. Malacia is poised to miss the remainder of the season whilst Shaw made a brief return in the FA Cup at Newport County, bu…