Real Madrid are currently top of the table and the Catalan side know that Los Blancos need to slip up if they are to have any chance of winning the title.
"Then we have to wait for the opponent to slip up.
"We're only thinking about our own games."
The 1-0 win over their cross-city rivals on Wednesday didn't come easily though, despite showing signs of life with an impressive defeat of Villarreal at the weekend.
"We knew how difficult the game would be because of their situation," he added, referencing Espanyol's need for a win to avoid relegation.
"There was some fatigue after the game on Sunday and it was noticeable in the intensity we had.
"The important thing is that we won and added more points."