Ronaldo’s miss cost Portugal the victory at the Parc des Princes, meaning that the 2004 finalists have taken just two points from two games at this European Championship.
Fernando Santos’ side now face a must-win game against current Group F leaders Hungary in their next outing, with Fonte expecting Ronaldo to be ready to lead the Portugal line again.
“He is mentally the strongest person in the world,” Fonte told Sport360. “This is not the first time that this has happened to him.
“Nobody can imagine the pressure he has on his shoulders. He deals with it every day, I wouldn’t worry about him.”
Despite Portugal’s struggles in front of goal in their opening two games, Fonte – an unused substitute in both games so far in France – believes his side have performed well and have what it takes to progress.
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“We are obviously disappointed not to get the three points but you can’t fault our hard work and the way we tried to score,” the Southampton centre-back said.
“Sometimes the ball doesn’t go in the net, and today was one of those days. There are no easy games in the Euros. It is just a shame that the goalkeeper has made some incredible saves.
“We just need to take the positives. We are creating chances and dominating games.
“We just have to win the last game. We are disappointed now, but tomorrow our heads will be clear.”
Fonte admitted that it’s been difficult to watch from the sidelines so far, but hailed the influence of Portugal’s supporters at Euro 2016.
He said: “It is hard to be on the bench, you feel the energy from the fans and you want to be a part of it. The stadiums generate an amazing atmosphere, and you just want to be part of it with your team-mates.”