Coach Carlos Queiroz said Iran will soak up the experience of facing World Cup contenders Spain on Wednesday but warned the Lions of Persia will produce their "best game ever" as they strive to cause the shock of the tournament.
Knowing his team would be facing a very defensive Iran team on Wednesday night, Hierro came up with a different formation to the one used for the 3-3 draw with Portugal last week. The kickoff of the second half, however, saw the Spanish side pick of momentum in their chase for a goal, creating a couple of chances.
Koke, Andres Iniesta, Sergio Busquets and Isco might feature, while in attack David Silva and Diego Costa, who scored twice in the opener, are certain to start.
"The match the other day was not easy but I think the team has shown we know what we are doing and we trust what we are doing".
After the second round of Group B matches, Spain and Portugal are jointly leading with four points, while Iran had three points with one win and one loss. Do not cut, copy or lift any content from this website without our consent.
With three points from their opening win against Morocco, Iran can still qualify for the knockout round but will need to beat Portugal on Monday in Saransk.
After a tiresome first half ended in a stalemate, Diego Costa gave La Roja the lead when his attempted shot took a big deflection off Ramin Rezaeian and into the back of the net.
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Spain turned up the heat after the break and got their reward nine minutes after the restart, although there was a huge slice of luck about Costa's third goal of the World Cup.
Iran fans all but tore their hair out late on when Vahid Amiri brilliantly nutmegged a defender to send a cross into Mehdi Taremi, but the forward sent a very gettable header from six yards out sailing over.
"We will stick to the style that defines us as a team, but we have to pass the ball around a lot more and maintain possession". Anyone who wants to win a World Cup will suffer.
He only had one chance against Iran, and he converted it.
For 2010 World Cup champion Spain, the draw had felt more like a defeat, especially given the team's inspired performance in spite of a tumultuous few days marked by their abrupt change in coaches on the eve of the tournament.
"Now we have to forget Portugal and concentrate on Iran".
Iran will also welcome back rising star Saeid Ezatolahi, who was suspended against Morocco, and - while it never seems wise to mess with a winning formula, the dynamic midfielder could prove impossible to omit.