The former Manchester United ace did not seem himself the whole night, and looked more frustrated as the game went on.
The Guardian reports how he accused Iceland of having a small mentality when he spoke to reporters after the game.
Ronaldo did not look like his usual self last night against Iceland
"When they don’t try to play and just defend, defend, defend, this in my opinion shows a small mentality and they are not going to do anything in the competition," he said.
Ronaldo's biting comments were surely due to his emotions running high. If he would have had time to analyse the game, he would have seen that Iceland had more than their fair share of chances.
The 31-year-old Real Madrid superstar went on further, describing Iceland's lack of ambition and how they relied entirely on luck, while criticising the country's celebrations after the game.
Ronaldo argued against every decision the referee made in Iceland's favour
“Iceland didn’t try anything," he added. "They were just defend, defend, defend and playing on the counterattack. It was a lucky night for them. We should have three points but we are OK. I thought they’d won the Euros the way they celebrated at the end. It was unbelievable."
Ronaldo will have to find his best form if Portugal are to make their mark on this tournament, because without him firing on all cylinders, they look like a very average side indeed.
Portugal's next game in Group F is against Austria in Paris on June 18.
Portugal need Ronaldo to be back to his best against Austria on Saturday