Koke adds some fizz to the midfield mixer.
We're going 4-3-3 so there's a strong trio in here. The ones who make the cut are Real's Luka Modric and Xabi Alonso, and Atletico's Koke.
We'll explain why, but you know how good these three are already and it will be just as interesting to see who didn't make it.
Modric is in the form of his life, running games and making those who doubted him at the start of his Madrid career eat humble pie.
Xabi Alonso is the same, careful, confident ball player he ever was and, along with Modric, will sit deeper.
Koke, meanwhile, is the gem in Atletico's midfield. A fine passer of the ball and energetic, he will be a pain for Ancelotti's side to deal with on Sunday.
Hardworking duo, former Chelsea man Tiago and captain Gabi, add clout to the Atletico midfield and help Simeone execute his game plan well but individually they don't have the sheer talent of these three.
Angel di Maria and Asier Illarramendi miss out for Madrid. Both are strong options and would certainly make our bench.
The former is not a natural central midfielder but thus far has performed well there.