Winning only three of their last eight league games, Simeone knows how quickly Real Madrid and Barca are closing the gap at the top of the table.
"I leave here knowing the team is playing well. We have to be calmer," Simeone told reporters after the Getafe stalemate. "We know that Real Madrid and Barcelona aren't going to lose until the end of the season.
"The nerves aren't going away and we just have to get on with it."
The Atletico boss added on the pressure that comes with leading the way in La Liga: "It's normal. We've been top for almost the whole season. There are still 11 games left to go.
"People were saying Barcelona were bad and look what they did in Paris. They have a new president and excitement is growing.
"Real Madrid always take points from their games. We have our job at hand as we continue down our path. We have two monsters below us that want to be where we are."
Winning their Monday clash with Huesca, Barcelona can reduce their distance to the top of the table to four points., while Real Madrid are 6 points away from their local rivals.