United’s 18-year-old teenager Marcus Rashford broke the deadlock in the 16th minute after he escaped the attentions of City’s experienced defender Martin Demichelis to score his third Premier League goal.
The youngster was denied a penalty before half-time but City escaped unpunished as Manuel Pellegrini’s side looked to find a route back into the game.
The hosts had a staggering 26 attempts on David De Gea’s goal but Sergio Aguero was unable to find an equaliser on Eastlands.
And the United number one was feeling in a mischievous mood as he sent out the below reminder to their derby rivals following Sunday’s win.
— David De Gea (@D_DeGea) March 20, 2016
United are in sixth place but level on points with top-four chasing West Ham United.
Van Gaal’s side are a point behind fourth-placed City in the race to secure a place in next season’s Champions League.
MORE: The latest football news