Hernandez scored twice as Manchester United won 5-0 against Bolton at the weekend to go top.
“He’s a menace to any defender”, Ferguson said of Hernandez to MUTV.
“If you look at his first goal, his movement and speed to get across in front of the defender was absolutely first class.
“Over the years you’ve always said that [players can struggle] if they have a good first year and they’re young, but I expected what I saw today.”
