New United boss Van Gaal is still in Brazil preparing for Holland 's World Cup semi-final with Argentina .
New United boss Van Gaal will leave the early training sessions to Giggs , who took charge the final four games of last season following David Moyes ' sacking .
New United boss Van Gaal is still in Brazil preparing for Holland 's World Cup semi-final with Argentina and will leave the early training sessions to Giggs , who took charge the final four games of last season following David Moyes ' sacking .