Athletic Bilbao striker Aritz Aduriz believes his side will need to stop Sergio Ramos if they are to enjoy a positive result against Real Madrid on Saturday.
The 36-year-old believes his Spanish international teammate – who has scored a number of big goals recently for Madrid including three headers in his last two appearances – is the main threat for Zinedine Zidane’s side.
"I don't know who will have to mark Ramos -- but whoever does has a big challenge," Aduriz told Cadena Cope.
"We will try to mark him as best we can.
"It really stands out that a player like him does the same thing over and over again. His capacity to attack the ball is overwhelming.
"Real Madrid is one of the best teams out there - we know in order to get a positive result we need to play a perfect game and have a good day. We can make life very difficult for them."