Iran will be looking to cause one of the biggest upsets in World Cup history when they take on Spain on Wednesday night.
The Asian side shocked Morocco in their first game, with an Aziz Bouhaddouz own goal in the fifth minute of added time giving them the victory.
And Carlos Queiroz's side could secure their place in the knockout stages with victory over Spain.
It'll be a tough ask, but one man who will be watching with curiosity is ITV pundit, Roy Keane.
The two worked alongside each other at Manchester United, where Keane was a player and Queiroz was an assistant manager to Sir Alex Ferguson.
The Irishman is part of ITV's punditry team for the match, and he dropped a brilliant comment about Queiroz before the game.
After being complimentary about the 65-year-old, Keane went full Roy Keane by commenting that he regrets not ripping his head off.
“Carlos Queiroz? He was an excellent coach," Keane admitted.
"Probably quite defence minded. I always felt we had a decent relationship, particularly during his first spell at United.
"Towards the end of my time at United, I found him really disrespectful to me so we had a bit of a fall out.
"He questioned my loyalty so I told him where to go. One of my big regrets is I didn't rip his head off.
"But yeah, he's an excellent coach."
That is just typical Roy Keane.
No other pundit in football, other than Keane, would even think about saying something like that on live TV.
The reaction from his colleagues in the ITV studio were equally as good. Slavan Bilic showed absolutely no emotion, but Ian Wright and Patrice Evra could not contain their laughter.
Keane's comments went down well with those on Twitter, with many fans in hysterics over his honesty.