Holtby, on-loan from Tottenham, said that he wanted to repay Rene Meulensteen's faith in him by helping Fulham to stay in the division.
He said: "We can definitely stay up. We said it to ourselves: we have 14 cup finals, we have to believe in it.
"If we give up, we are in the wrong game. We want to stay in the Premier League and if we play against teams like Manchester United, Chelsea, Liverpool, Tottenham, whoever, they are going to be hard games, especially away, and that is when you have to have a defensive shape. When you play against the other teams down at the bottom like we are then it is a different game.
"You always have to believe that you can get something, even when United scored their second. It sounds pretty awkward but you always have to believe in that. You have to have that winning mentality which we are going to have on the field. I am so delighted that Sidwell had a fantastic game and really worked hard for those two goals."