Van Gaal was subjected to the jeers of supporters following last Saturday 's 1 - 0 defeat against Southampton at Old Trafford .
Van Gaal admits that Van Gaal must rebuild the trust of those fans who no longer believe in Van Gaal 's approach .
Van Gaal was subjected to the jeers of supporters following last Saturday 's 1 - 0 defeat against Southampton at Old Trafford and he admits that he must rebuild the trust of those fans who no longer believe in his approach .