Real Madrid coach Carlo Ancelotti says they face Cadiz confident of victory.
Real will be missing several senior players on the night.
But Ancelotti said: "We don't have to change our identity too much. We're playing against a team that maybe has less quality than others but they have a very clear identity and are well drilled.
"They make good use of set-pieces and are quick on the counter-attack. It's a game like any other and if we have to defend deep, we'll do it. This isn't going to change the style from the last few games. We have to stress that we have defended well. We've improved a lot since the first part of the season on the defensive side.
"This is what's improved the most since the beginning of the season."
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