Hernandez reacted to Ferguson's retirement on TV Azteca.
"When I retire it will be satisfying to say that I was one of Sir Alex Ferguson's boys," he said.
"But it's more than an anecdote for me. I see it as an achievement and a blessing. It's a source of pride to say I was with one of the best coaches in history.
"Something that impresses me is that he never lost his competitiveness. In spite of everything he won he continues to be hungry. He's a winner."