Spanish playmaker Isco say Wednesday's (Jun 20) match against Iran will determine their World Cup destiny as they seek to register their first win in Russian Federation following a gripping 3-3 draw against Portugal.
The result puts Spain top of Group B ahead of Portugal - who beat Morocco 1-0 earlier in the day - on the "fair play" rule, with both having four points and the same goal difference, but Spain receiving fewer bookings.
Spain was mostly unsafe from set-pieces, including in the 25th minute when a free kick from David Silva that took a deflection was stopped by Iran goalkeeper Ali Beiranvand.
Iran was later denied an equaliser by the video assistant referee as the got a word in his ear that "goal-scorer" Saeid Ezatolahi was in fact offside.
Queiroz's troops continued to threaten as the second half went on, with Mehdi Taremi heading over the crossbar at the far post on 81 minutes.
Chris Fox: Ronaldo's hat-trick and Kane's last-minute victor have just been overshadowed by the Iran throw-in as the moment of World Cup so far. Get the app and get the game.
Russian Federation v Egypt: Key talking points
But it was also a reminder to Egypt that the World Cup can be an unforgiving tournament. Trezeguet will start on the left while Mohamed Salah (if fit) will start on the right.
A win against Iran will leave Spain on the brink of a place in the last 16, despite all the upheaval of the past week. "Best world Cup ever without a doubt." added another.
Not an impressive result for Spain, who didn't look almost as sharp in attack as they did in the 3-3 draw against Portugal to open the tournament.
Spain coach Fernando Hierro welcomed Real Madrid's Dani Carvajal back into the starting line-up following his recovery from a hamstring injury suffered in the Champions League final win over Liverpool. He also has nine goals in his last nine starts for Spain.
Here's how to watch Spain vs. Iran online.
Bilic argued that he had sympathy for Spain due to how Iran had set up defensively but former England striker Ian Wright and Keane seemed to disagree strongly with the former Hammers boss with Wright highlighting that Spain should have played better in the first-half while Keane threw his eyes to the heavens.
What time does the FIFA World Cup 2018 Iran vs Spain begin in IST?