Shrink: Real Madrid star Ronaldo suffering Barcelona-itis!

A Portuguese sports psychologist says Real Madrid star Cristiano Ronaldo is "allergic" to big games.

Ronaldo faces Barcelona in the Copa del Rey tonight under huge pressure to perform after a poor El Clasico before Christmas.

Speaking with Diário de Notícias, Jorge Silverio says: "Cristiano is suffering from an allergy before big games. He feels that the expectations are huge and is struggling with the pressure."