If Diego Simeone’s side can beat their city rivals—and, this season, their title rivals—it will be the first time they have ever won three games running against Real.
He has already made history by taking them to the top of La Liga, breaking Barcelona’s record stint at Spanish football’s peak, and will be relishing the battle against Carlo Ancelotti’s side.
Barcelona, meanwhile, are firm favourites to see off the Basque club who haven’t reached a Copa del Rey final since 1988.
Sociedad have struggled on the road too, whereas the Blaugrana are strong at home.
At least until Valencia’s triumph there on Saturday.
That Barcelona defeat will give Jagoba Arrasate some hope, as his men prepare for their Camp Nou trip.
Here, we take a look at five things to look out for in these semi-finals.