Real Madrid coach Carlo Ancelotti expects a major test against Rayo Vallecano.
Real go Rayo on Sunday.
Ancelotti said: "Vallecas is always a tough place to play at. It has been in the past and it'll be a tough game, against a team that needs points and who have changed their manager this week.
"They have extra motivation and we'll have to be at our best because these are big moments in the season and we have to make the most of them.
"We've watched videos and tried to prepare for the game in the best possible way because we know it's a vital game for our season."