Sergio Aguero was the Premier League’s top scorer last season with 26 goals – five more than Tottenham’s Harry Kane and 14 more than Rooney
Wayne Rooney was Manchester United’s top scorer last season with 14 goals, but Van Gaal says that the 29-year-old must improve on that tally if he is plays, as planned, as a single striker.
Manchester City’s Sergio Aguero scored 32 goals in 42 games for Manchester City last season.
“He has to score the amount of goals that Aguero gets,” said Van Gaal. “He is our striker. He has to prove he can do it but I have full confidence that he shall.
“Rooney has said that he scores at the minimum 25 goals. So when I have a striker that scores 25, then I am better off.”
Rooney last scored more than 25 goals for his club in 2011-12 when he found the net 35 times for United.