During the 1950s, the rivalry was exacerbated further when there was a controversy surrounding the transfer of Alfredo Di Stéfano, who finally played for Real Madrid and was key to their subsequent success.
Selama tahun 1950, persaingan tersebut memburuk saat ada kontroversi seputar transfer Alfredo Di Stéfano, yang akhirnya bermain untuk Real Madrid dan merupakan kunci kesuksesan mereka berikutnya.