Hernandez’s Euro double secured a 2-1 win for United over Marseille in the last 16 of the Champions League.
Ferguson told Sky Sports, when asked about the partnership between Rooney and Hernandez: “It has developed very well.
“Where Wayne has been playing in the last couple of games, he is a real threat to teams because he has got such power and speed with the ball.
“And, of course, Hernandez is unbelievable, his movement. Did you see his movement for the (opening) goal?
“He has made three different types of run – in, out, in, out – and the boy has just got goals in him.”
Ferguson also commented on the injuries to defenders John O’Shea and Rafael.
He said: “It was nervy because we kept having players taken off with injuries and it shook the balance of the team in a big way.
“I thought we were quite comfortable, and then O’Shea is off, and then Da Silva (Rafael) is off. We had made a substitution, which was a killer because we could have brought (Darron) Gibson on to give us a bit more height.
“The problem tonight was always going to be height. Their (Marseille’s) set-piece play, of course, was very good and it caused us a lot of problems.”
O’Shea and Rafael did both suffer hamstring injuries.
Ferguson said: “You have got to remember, if you look at the games we’ve had over the last couple of weeks – Chelsea and Liverpool away from home, Arsenal in an FA Cup tie, tonight – it is a big demand on players.
“The speed of the game today catches you out.”
