Asked whether any of the England squad would flourish in La Liga, Ramos replied: "Harry Kane is physically a fantastic striker but also technically.
"He can surprise you - but not me as we have prepared for him. There are always very technical players in the England team that are dangerous but I can assure you we have been watching them.
"We know the level of difficulty will be very high. We know we have a fantastic national team in front of us, and even though we played a great game at Wembley there are things we can improve.
"England had a fantastic World Cup. They have a lot of personality despite being very young, and offensively they are very dangerous.
"Harry Kane is a very good player. We have to keep his scoring drought going because that will be a good sign for us."