Saeid Ezatolahi will attempt to put aside the disappointment of seeing his potential equaliser against Spain ruled out for offside when Iran go for a win against Portugal that would fire them into the knockout phase of the World Cup for a first time.
Spain took all three points at Kazan Arena on Wednesday thanks to a fortuitous Diego Costa goal to leave Carlos Queiroz's side needing to beat his countrymen in their final group match in Saransk on Monday to advance to the Round of 16.
"Our full concentration is now on Portugal and we have a very hard task ahead of us, but we are determined to get this win," said the midfielder, who missed Iran's win over Morocco in their opening game due to suspension.
"The result against Spain could've been better for us, we deserved more but this is why we call it the beautiful game. Sometimes the ball just doesn't go in the goal.
"But we performed brilliantly for such a young team and with such a great coach and we were able to pay back his trust and determination and his hard work.
"A lot of people enjoyed this and we did everything with all of our hearts."
Iran adopted an ultra-defensive approach until Costa finally broke their stubborn resistance nine minutes into the second half when he deflected Raman Rezaeian's attempted clearance beyond goalkeeper Alireza Beiranvand with his knee.
The goal prompted the Iranians to open up and Queiroz's team caused the 2010 world champions plenty of problems as they sought an equaliser.
Ezatolahi thought he had levelled the scores when he swept the ball home after the Spanish defence failed to clear Rezaeian's free kick, only for referee Andres Cunha to rule the goal out after consultation with VAR officials.
"I thought it was a goal and for that fraction of a second I was thinking about all the hard work that I had done and, because in the first game I was suspended, I was under a lot of pressure," the 21-year-old said.
"God helped me to play well but unfortunately we couldn't score, the goal didn't count.
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