Cristiano Ronaldo continues to struggle with a knee injury as his country goes into a match it will likely need three points from.
Ronaldo has been struggling with a knee injury since the final weeks of the domestic season, with reports in Spain before the tournament suggesting he is endangering his career by playing through the pain.
He completed most of his country’s training session Wednesday but left early with heavy strapping on his troublesome left knee.
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Pepe will miss the game at the Arena da Amazonia thanks to the red card he picked up against Germany, and Coentrao has been ruled out of the tournament after being stretchered off in the same game.
Ricardo Costa filled in at center back against the Germans and Andre Almeida replaced Coentrao, and both are expected to start Sunday.
Should Ronaldo not make it, coach Paulo Bento will likely bring in Silvestre Varela on the left, and there are also concerns about Hugo Almeida, who departed for Eder in the Germany defeat.
Meanwhile, the USA will seal its progression with a win. The Americans are without striker Jozy Altidore, who pulled his left hamstring in the opening victory against the Ghanaians. Aron Johannsson or Chris Wondolowski should take his place.
Tactical uncertainty has been a feature of Jurgen Klinsmann’s reign, and it has been difficult to predict which players and even which system he will use from game to game, so there may be a surprise in store.
The last time the two sides met was at the 2002 World Cup, with the United States winning 3-2.
Portugal coach Bento came on as a second-half substitute in the match, which was refereed by Byron Moreno, the since-disgraced Ecuadorian who served 26 months in a U.S. jail after trying to smuggle six kilograms of heroin through JFK Airport.