The 28-year-old striker is expecting a tough game against the world champion, but believes "the best player in the world" can help the Seleccao reach the final.
Almeida, who currently plays for Besiktas, made his first appearance at the European Championship when he replaced the injured Helder Postiga against Czech Republic in the Seleccao's 1-0 quarterfinal win. Ronaldo scored the decisive goal that night and Almeida stated he will be happy to see the Real Madrid star receive the attention of the Spanish defence at the Donbass Arena.
"Cristiano, being the best player in the world, has just been outstanding," Almeida said. "He is having a great tournament and it does not bother us if they talk about him. We are a unit and as a unit we are playing very well.
"They also have to be worried about us. Portugal has a good team and we will do everything to reach the final.
"The team has been playing better and better as time goes, since we have more time to train together. We are playing as a unit and it shows on the pitch.
"And against the world champion I hope we will be able to show our best game and qualify for the final. However, it won't be easy and we need to take advantage of our opportunities."
Paulo Bento's side has the opportunity to avenge the 1-0 loss to La Roja at World Cup 2010 by continuing the form that saw it emerge from a group containing Germany, Netherlands and Denmark, and Almeida insisted it should not fear the world and European champion.
He said: "Every game is more difficult than the other. However, we were in the most difficult group of the competition and we did fairly well.
"I believe the four teams that are in the semifinals deserve to be here. All of them are playing good soccer now."
A win over Vicente del Bosque's side will put the Seleccao into their first final since the Euro 2004 loss to Greece, but Almeida refused to look too far ahead.
"First of all, we need to beat Spain, which is not easy," the 28-year-old added. "Then, as you know, there is no favourite opponent since Italy and Germany are great teams. But I don't want to look ahead. We must beat the world champion first.
"Spain has a great team with great players. They will always be strong, but I think Portugal is also strong and has everything to come out the winner of this match.
"It has been a great Euros. I just hope we can end up as the champions."
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