Real Madrid defender Sergio Ramos has warned Atletico Madrid fans after teammate Cristiano Ronaldo was struck by a lighter during victory in the Copa del Rey.

He was struck by a lighter as he walked off at half-time alongside Ramos.

"Calderón is a stadium that shows its affection for their team. Things like that taint and damage a game like football. That's why there are cameras, and if they detect it, the person should be prohibited from coming in during a good long time," said Ramos.