Man United beat Man City 1 - 0 in derby 's under 18 fixture . Callum Gribbin scored the winning goal at Moss park , Altrincham . The victory leaves United two points behind leaders Middlesbrough . The ' real ' Manchester fixture takes place at Old Trafford on Saturday .
Man United beat Man City 1-0 in Saturday 's under 18 encounter . Callum Gribbin scored the winning goal at Moss Lane , Altrincham . The result leaves United two points behind leaders Middlesbrough . The 'real ' Manchester derby takes place at Old Trafford on Sunday .