Park, as the team captain, has borne the brunt of criticism for QPR's season so far.
But Fernandes says he is "a top class player and a fantastic guy," and as an Asian himself, he was "proud" of having an Asian captain on his club.
"It's a new experience for him in that he's never played so much (on Manchester United)," Fernandes said. "He also has to adjust to new players. I am not the sort of person that's going to write people off after six or seven games."