Portugal coach Paulo Bento hopes his team will take the fight to Spain and impose their own way of playing in the European Championship semi-finals.
Spain are favoured to reach their third consecutive major tournament final, and few teams have dared to attack the defending champions for fear of being cut to shreds on the break.
But Bento thinks Portugal has enough ability to give Spain plenty to worry about.
"There are some points in their game that are not so stable. They had some problems against Italy and Croatia, even in the quarter-final against France, they didn't create too many clear chances," Bento said on Tuesday.
"But we're not inspired by what the others did against Spain but what we did against other teams. We have our own identity."
Portugal needed a late header from Cristiano Ronaldo to get the better of a battling Czech Republic side in the quarter-final, but the scoreline could have been much greater if not for an inspired performance by goalkeeper Peter Cech, coupled with some careless finishing.
"Our aim is not to defend all the time. We won't do that, we are aware it's going to be difficult, but the others also know we can cause them a lot of problems," Bento said.
"There can't be any more beautiful opportunity than the one we will have tomorrow. We won't have any anxiety, we are aware of the opportunity that we have for all the Portuguese people."