Ivan Rakitic insists Real Madrid can slip up after Barcelona's win over Las Palmas.
Sevilla, on paper at least, were Real Madrid's toughest remaining opponent, and the Catalans will be hoping Celta and Malaga put up a bigger fight.
"Of course Real Madrid can still slip up in Vigo or Malaga," the Croat said in his post-match comments. "Those are two difficult stadiums to play in.
"What we have to do is rest and focus on what we can do, which is to prepare Sunday's match as best we can.
"We'll wait for a mistake and hopefully that'll happen on Wednesday, but we are Barcelona and what we have to do is focus on ourselves."