Portugal´s forward Cristiano Ronaldo controls the ball during the Russian Federation 2018 World Cup Group B football match between Portugal and Morocco at the Luzhniki Stadium in Moscow on June 20, 2018.
The result left Portugal with four points from two matches, following their 3-3 draw against Spain on Friday.
Iran vs Spain - Up against Team Melli, La Roja's were the hot favourites.
"It's so hard to play against a team that only wants to close you down, but these are the types of games that win you a World Cup", said defender Dani Carvajal after Diego Costa's rebounded goal took them level with Portugal on top of Group B.
Hierro said he has reason to worry after a string of surprising opening-round results in Russian Federation.
Portugal were not the best team on the pitch, despite their win.
Former FIFA president Sepp Blatter attended a World Cup match in Moscow on Wednesday, saying the tournament in Russian Federation felt like "my World Cup", but soccer's world governing body said his presence did not directly violate his ban from football activities. Iran has three points, and an even goal difference.More news: ZTE shares plunge after Senate votes to veto Trump reprieve
"In certain groups teams have already qualified (for the last 16) but our group is very tough". We will learn a lot from this game.
Spain's bid for a second World Cup title eight years after their first, began in the worst-possible fashion, with coach Julen Lopetegui sacked on the eve of the tournament after Real Madrid announced he would be joining the club in July.
Puskas played for both Hungary and Spain in his career, but he scored all of his 84 official goals for the iconic Mighty Magyars.
But at the 2018 World Cup, it appears that Ronaldo is looking to end the debate, and he's trolling Messi with his facial hair as a part of his campaign.
Here we take a look at the five most prolific talismen in global football. But as long as Portugal have Ronaldo, they'll feel good about their chances. "We'll fight for our dreams".
Basically, if Spain loses to Morocco 2-1 while Portugal loses to Iran 2-1 (and this is just an example, it applies to any score in which both squads lose), then we're going deep into tiebreakers.
"But this was our first match point, if we compare this to tennis, our second match point comes against Portugal".