Asked about United's desperate decline, Hernandez said: “It doesn't surprise me because in life it's not easy having a manager for 26 years in the way that Sir Alex did it.
“To substitute that man like that is not easy.
“It is like winning the lottery. Do you think anyone you hire afterwards is going to be able to do 80 per cent of what Ferguson did?
“My point of view is that after Ferguson brings so much pressure that it just isn't going to work out.
“United need to now get over the fact that Sir Alex Ferguson has gone.
“Would we like to have someone similar? Yes, yes, yes. But Sir Alex has gone and it is never going to be the same.
“So United have to adapt and allow the next manager to do it in his own way."
Regardless of their current struggles, the ex-Real Madrid man says he'd play for nothing if ever asked back to Old Trafford.
Hernandez said: “Man, I mean, there are these situations and I know the narratives because of my age and my past.
“If United came for me then I'd say 'yes, I'll play for free.' Of course, you know, I'd do that.
“But I also want to be very respectful to my club. I am playing very consistently and in my mind and my world, my conviction is all about winning a championship with LA Galaxy."