The capital outfit have taken just two points from their last six matches, with that run of form leaving them in 12th position in the table.
As it stands, they are just five points outside of the relegation zone, which is currently occupied by Real Valladolid, Rayo Vallecano and Real Betis.
"Anytime we don't get a victory, we leave feeling sad. But on Sunday we need to win and we have to changing things today. We have to train well, end the week in the best way possible, but we need to be in good spirits and relaxed," Lopez told reporters at a press conference.
"When you don't win, things just get worse out there, but things aren't complicated for us just yet. There are other clubs worse off than we are, we are fine.
"We need to win and look at the teams above us rather than the ones below us. It all depends on us, we need to keep working hard. We need to work twice as hard in order to win."
Lopez is currently on loan at Getafe from Portuguese outfit Benfica.