QPR have collected only two points from their opening seven games.
But Fernandes tweeted on Sunday: "For all QPR fans. Fans who analyse properly. I am not changing anything. And all shareholders agree.
"No team except the first game [a 5-0 home defeat to Swansea] has outplayed us. We need a consistent four defenders not changing every week especially right and left-back. Mark is the right man."
He added: "For all those calling for change, this is the team that outplayed Spurs and gave Chelsea a damn good game and you want change. No way."