Spanish goalkeeper and captain of the national team Iker Casillas has said that his teammates should be warned enough about the danger posed by his Real Madrid teammate Cristiano Ronaldo. The 27-year-old Portuguese will be lining up against the Spanish in the semifinals of the Euro 2012. Even though the Real Madrid attacker did not have the best start to the competition, he has come to form at just the right stage in the competition. He almost single-handedly helped Real Madrid win the la Liga title this season, while he was crucial to Portugal’s success against the Czech Republic in the quarter-finals of the competition.

Even though he created a number of opportunities in the match against the Czech Republic, he was unable to convert most of them due to bad luck. It is the recent form that is extremely threatening for Spain according to goalkeeper Iker Casillas, who has also said that he is extremely sure that Ronaldo is yet to hit his peak form. Ronaldo is one of the top scorers in the competition after having scored three goals till date. They will know that he can single-handedly help Portugal reach the finals of the competition.

‘His season at Madrid was incredible in terms of the way he played, the goals and the records. I don’t think that right now he is at his best level. It doesn’t quite reach those extremes but if you give it a good whack it always swerves in a deceptive way. I’ll have to be on my guard,” said Spain goalkeeper Iker Casillas.

Meanwhile, Spain will be looking to hand athletic Bilbao striker Fernando Llorente a surprise starter in the match against Portugal. Llorente impressed in the quarter-final match against France after coming on as a substitute for Fernando Torres.