Spain forward Rodrigo has called for Portugal to come out and play in their World Cup opener on Friday.

Friday's Iberian derby in Sochi, in the sides' opening match of Group B, is between two of the favourites for the trophy.

Valencia's Rodrigo knows the European champions are more than a one-man team and hopes Portugal will not just sit back and play on the counter-attack against Spain.

"Portugal are a team that feel comfortable on the counter-attack," Rodrigo told a media conference on Monday.

"I hope they do not go out to lock up and we play against each other."

Rodrigo reckons Portugal's Euro 2016 win, despite Real Madrid ace Ronaldo departing injured in the final, showed the strength of the opposition Spain will face.

"Their main reference is Cristiano, one of the best in the history of football," he added.

"But they have shown in the last European Championship that they are more than that.

"They are a solid group, with a lot of unity, they have shown that football is a collective sport.

"Unity is strength. We must be concentrated. They are the current European champions and they are among the favourites to do something big."

If Portugal do sit back, Rodrigo believes Spain are capable of breaking them down.

"We should not change our style, we have enough weapons to face any team," he added.

Spain lost the opening game of the 2010 World Cup to Switzerland, but went on to win the tournament in South Africa.

"It's important but it's not definitive," Rodrigo added.

"It's important to start on the right foot, but we have examples like 2010, with what happened against Switzerland.

"We only think about winning, it's the main goal, to make a good game and win it."

Asked which other teams will be in contention for the trophy, Rodrigo picked out another European rival.

"I think Belgium has a great team, with their best generation in history and they can play a good role," he added.